ULTRAMAR DIAMOND SHAMROCK CORP
10-Q/A, 1998-10-28
PETROLEUM REFINING
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                   FORM 10-Q/A


QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES  EXCHANGE ACT
OF 1934

For the quarterly period ended June 30, 1998


                         Commission File Number 1-11154
                         ------------------------------

                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
             (Exact name of registrant as specified in its charter)

              Incorporated under the laws of the State of Delaware
                  I.R.S. Employer Identification No. 13-3663331

                               6000 N Loop 1604 W
                          San Antonio, Texas 78249-1112
                        Telephone number: (210) 592-2000

                        ---------------------------------

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                                  Yes X No ____


As of July 31, 1998,  90,284,816  shares of Common Stock,  $0.01 par value, were
outstanding,  and the aggregate  market value of such shares as of July 31, 1998
was $2,364,334,000.

<PAGE>


                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
                                    FORM 10-Q
                                  JUNE 30, 1998

                                TABLE OF CONTENTS



PART I - FINANCIAL INFORMATION
                                                                            PAGE
  Item 1.  Consolidated Financial Statements (Unaudited)

    Consolidated Balance Sheets as of June 30, 1998
      and December 31, 1997...........................................        3

    Consolidated Statements of Operations for the Three and Six
      Months Ended June 30, 1998 and 1997.............................        4

    Consolidated Statements of Cash Flows for the Three and Six
      Months Ended June 30, 1998 and 1997.............................        5

    Consolidated Statements of Comprehensive Income (Loss)
      for the Three and Six Months Ended June 30, 1998 and 1997.......        6

    Notes to Consolidated Financial Statements........................        7

  Item 2.  Management's Discussion and Analysis of Financial
    Condition and Results of Operations...............................       12


PART II - OTHER INFORMATION

  Item 1. Legal Proceedings...........................................       27

  Item 6. Exhibits and Reports on Form 8-K............................       27


SIGNATURE.............................................................       28


<PAGE>

PART I.  FINANCIAL INFORMATION

ITEM 1.  CONSOLIDATED FINANCIAL STATEMENTS
<TABLE>
<CAPTION>
                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
                           CONSOLIDATED BALANCE SHEETS

                                                                                June 30,        December 31,
                                                                                 1998              1997
                                                                             -------------       ----------
                                                                              (Restated)
                                                                              (Unaudited)
                                   Assets                                              (in millions)
Current assets:
<S>                                                                             <C>            <C>        
   Cash and cash equivalents....................................................$   112.5      $      92.0
   Accounts and notes receivable, net...........................................    583.9            673.9
   Inventories..................................................................    622.1            741.0
   Prepaid expenses and other current assets....................................     42.3             53.1
   Deferred income taxes........................................................     44.9             50.8
                                                                                  -------          -------
      Total current assets......................................................  1,405.7          1,610.8
                                                                                  -------          -------

Property, plant and equipment...................................................  4,618.2          4,654.3
Less accumulated depreciation and amortization.................................. (1,190.9)        (1,093.3)
                                                                                  -------          -------
   Property, plant and equipment, net...........................................  3,427.3          3,561.0
Other assets, net...............................................................    388.2            422.9
                                                                                  -------          -------
    Total assets................................................................$ 5,221.2        $ 5,594.7
                                                                                  =======          =======

                    Liabilities and Stockholders' Equity

Current liabilities:
   Notes payable and current portion of long-term debt........................  $     6.9        $     6.5
   Accounts payable.............................................................    295.2            661.7
   Accrued liabilities..........................................................    379.5            331.9
   Taxes other than income taxes................................................    278.1            237.2
   Income taxes payable.........................................................     16.1             13.4
                                                                                  -------          -------
      Total current liabilities.................................................    975.8          1,250.7
                                                                                  -------          -------

Long-term debt, less current portion............................................  1,869.0          1,866.4
Other long-term liabilities.....................................................    389.9            403.5
Deferred income taxes...........................................................    192.5            187.5
Commitments and contingencies

Company obligated preferred stock of subsidiary.................................    200.0            200.0

Stockholders' equity:
   5%Cumulative   Convertible  Preferred  Stock,  par  value  $0.01  per  share:
     25,000,000  shares  authorized,  no shares and 1,724,400  shares issued and
     outstanding as of
     June 30, 1998 and December 31, 1997........................................       -               0.0
   Common Stock, par value $0.01 per share:
     250,000,000 shares authorized, 90,283,000 and
     86,663,000 shares issued and outstanding as of
     June 30, 1998  and December 31, 1997.......................................      0.9              0.9
   Additional paid-in capital...................................................  1,511.2          1,534.9
   Treasury stock...............................................................      -              (30.1)
   Retained earnings............................................................    173.2            259.1
   Accumulated other comprehensive loss.........................................    (91.3)           (78.2)
                                                                                  -------          --------
     Total stockholders' equity.................................................  1,594.0          1,686.6
                                                                                  -------          -------
     Total liabilities and stockholders' equity.................................$ 5,221.2        $ 5,594.7
                                                                                  =======          =======

          See accompanying notes to consolidated financial statements.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)


                                                                    Three Months Ended         Six Months Ended
                                                                        June 30,                   June 30,
                                                                        --------                   --------
                                                                     1998          1997         1998         1997
                                                                     ----          ----         ----         ----
                                                                  (Restated)                 (Restated)
                                                                   (in millions, except share and per share data)
<S>                                                               <C>           <C>          <C>          <C>
   Sales and other revenues (including excise taxes).........     $ 3,041.0     $ 2,414.4    $ 5,830.6    $ 4,964.6
                                                                  ---------     ---------    ---------    ---------

   Operating costs and expenses:
      Cost of products sold..................................       1,726.4       1,485.8      3,347.7      3,135.5
      Operating expenses.....................................         288.0         192.2        575.9        402.4
      Selling, general and administrative expenses...........          94.4          69.7        173.0        141.7
      Taxes other than income taxes..........................         758.0         520.6      1,436.3      1,029.8
      Depreciation and amortization..........................          58.1          45.5        123.5         89.7
      Restructuring charges..................................         131.6            -         131.6           -
                                                                  ---------     ---------    ---------    ---------

         Total operating costs and expenses..................       3,056.5       2,313.8      5,788.0      4,799.1
                                                                  ---------     ---------    ---------    ---------

   Operating (loss) income...................................         (15.5)        100.6         42.6        165.5
     Interest income.........................................           2.2           5.5          4.3          7.9
     Interest expense........................................         (36.0)        (29.6)       (72.1)       (62.1)
     Gain on sale of property, plant and equipment...........             -             -          7.0         11.0
                                                                  ---------     ---------    ---------    ---------

   (Loss) income before income taxes and dividends of
     subsidiary..............................................         (49.3)         76.5        (18.2)       122.3
     Provision for income taxes..............................          (0.7)        (30.2)       (12.8)       (48.4)
     Dividends on preferred stock of subsidiary..............          (2.6)            -         (5.2)           -
                                                                  ---------     ---------    ---------    ---------
   Net (loss) income.........................................     $   (52.6)    $    46.3    $   (36.2)   $    73.9
                                                                  =========     =========    =========    =========

   Net (loss) income per share:
      Basic..................................................       $ (0.58)       $ 0.60     $ (0.42)      $ 0.96
      Diluted................................................       $ (0.58)       $ 0.59     $ (0.42)      $ 0.94

   Weighted average number of shares (in thousands):
      Basic..................................................         90,220       74,799      88,760       74,762
      Diluted................................................         90,220       79,113      88,760       78,997

   Dividends per share:
      Common Shares..........................................        $ 0.275      $ 0.275     $ 0.550      $ 0.550
      5% Cumulative Convertible Preferred Shares.............        $     -      $ 0.625     $ 0.625      $ 1.250


          See accompanying notes to consolidated financial statements.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)

                                                                              Six Months Ended June 30,
                                                                              -------------------------
                                                                              1998               1997
                                                                              ----               ----
                                                                           (Restated)
                                                                                    (in millions)
Cash Flows from Operating Activities:
<S>                                                                        <C>                 <C>
Net (loss) income.............................................             $  (36.2)           $   73.9
Adjustments to reconcile net (loss) income to
  net cash provided by (used in) operating activities:
   Depreciation and amortization..............................                123.5                89.7
   Provision for losses on receivables........................                  6.9                 5.6
   Restructuring charges - write-down of property, plant
     and equipment and goodwill...............................                 82.1                   -
   Gain on sale of property, plant and equipment..............                 (8.4)              (14.5)
   Deferred income tax provision..............................                  4.5                42.8
   Other, net.................................................                  1.6                 1.8
   Changes in operating assets and liabilities:
     Decrease in accounts and notes receivable................                 80.5                47.7
     Decrease in inventories..................................                114.7                69.5
     Decrease (increase) in prepaid expenses and other
       current assets.........................................                 10.7                (6.6)
     (Increase) decrease in other assets......................                 (3.4)                5.7
     Decrease in accounts payable and other current liabilities              (274.1)             (334.4)
     Decrease in other long-term liabilities..................                 (3.9)              (42.9)
     Other, net...............................................                    -                (10.1)
                                                                            -------             ---------
       Net cash provided by (used in) operating activities....                 98.5               (71.8)
                                                                            -------             ---------

Cash Flows from Investing Activities:
 Capital expenditures.........................................                (64.9)             (115.7)
 Acquisition of marketing operations..........................                    -                (9.9)
 Deferred maintenance turnaround costs........................                (21.1)              (10.4)
 Expenditures for investments.................................                    -                (7.8)
 Proceeds from sales of property, plant and equipment.........                 48.2                72.7
                                                                            -------             -------
   Net cash used in investing activities......................                (37.8)              (71.1)
                                                                            -------             -------

Cash Flows from Financing Activities:
 Net change in commercial paper and short-term
  borrowings..................................................                 37.2               (37.9)
 Proceeds from long-term debt.................................                    -                10.6
 Repayment of long-term debt..................................                (34.0)              (88.7)
 Issuance of Company obligated preferred stock of subsidiary..                    -               200.0
 Payment of cash dividends....................................                (49.7)              (43.6)
 Other, net...................................................                  6.6                (1.7)
                                                                            -------             -------
   Net cash (used in) provided by financing activities........                (39.9)               38.7
Effect of exchange rate changes on cash.......................                 (0.3)               (0.7)
                                                                            -------             -------
   Net Increase (Decrease) in Cash and Cash Equivalents.......                 20.5              (104.9)
Cash and Cash Equivalents at Beginning of Period..............                 92.0               197.9
                                                                            -------             -------
Cash and Cash Equivalents at End of Period....................              $ 112.5            $   93.0
                                                                            =======             =======

          See accompanying notes to consolidated financial statements.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
             CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
                            (Unaudited, in millions)


                                                                   Three Months Ended             Six Months Ended
                                                                        June 30,                      June 30,
                                                                       ---------                      --------
                                                                     1998            1997        1998          1997
                                                                     ----            ----        ----          ----
                                                                  (Restated)                  (Restated)

<S>                                                               <C>             <C>         <C>           <C>
   Net (loss) income........................................      $ (52.6)        $ 46.3      $ (36.2)      $ 73.9

   Other comprehensive (loss) income, net of tax -
       Foreign currency translation adjustment..............        (16.8)           1.3        (13.1)        (2.6)
                                                                     ----          -----         ----        -----

   Comprehensive (loss) income..............................      $ (69.4)        $ 47.6      $ (49.3)      $ 71.3
                                                                     ====           ====         ====         ====


          See accompanying notes to consolidated financial statements.
</TABLE>
<PAGE>


                      ULTRAMAR DIAMOND SHAMROCK CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                  June 30, 1998
                                   (Unaudited)

NOTE 1:  Basis of Presentation

The accompanying  unaudited consolidated financial statements have been prepared
by Ultramar  Diamond Shamrock  Corporation  (the "Company"),  in accordance with
generally  accepted  accounting  principles for interim financial  reporting and
with Securities and Exchange  Commission rules and regulations for Form 10-Q. In
the opinion of  management,  all  adjustments  (consisting  of normal  recurring
accruals) considered necessary for a fair presentation have been included. These
unaudited  consolidated  financial statements should be read in conjunction with
the audited consolidated  financial statements and notes thereto included in the
Company's annual report on Form 10-K for the year ended December 31, 1997.

Operating  results  for the three and six  months  ended  June 30,  1998 are not
necessarily  indicative  of the results that may be expected for the year ending
December  31,  1998.  The  results of  operations  may be  affected  by seasonal
factors,  such  as  the  demand  for  petroleum  products  and  working  capital
requirements in the Northeast System,  which vary significantly during the year;
or  industry  factors  that may be  specific  to a  particular  period,  such as
movements  in and the  general  level of crude oil  prices,  the  demand for and
prices  of  refined   products,   industry   supply   capacity  and  maintenance
turnarounds.

NOTE 2:  Adoption of Accounting Pronouncements

Effective March 31, 1998, the Company adopted the Financial Accounting Standards
Board's  (FASB)  Statement of  Financial  Accounting  Standards  (SFAS) No. 130,
"Reporting  Comprehensive Income," which established standards for reporting and
display of comprehensive income and its components  (revenues,  expenses,  gains
and losses) in a full set of general-purpose  financial statements.  The Company
added separate  statements of  comprehensive  income (loss) and certain  amounts
from prior periods have been  reclassified to conform with the new  requirements
of SFAS No. 130.

NOTE 3:  Inventories

Inventories consisted of the following:

                                                    June 30,       December 31,
                                                     1998             1997
                                                 ------------      ------------
                                                          (in millions)

Crude oil and other feedstocks................     $280.2            $342.7
Refined and other finished products and
     convenience store items..................      281.5             340.5
Materials and supplies........................       60.4              57.8
                                                    -----            ------
     Total inventories........................     $622.1            $741.0
                                                    =====             =====
During the quarter  ended June 30, 1998,  the Company  recorded a $12.5  million
($7.3  million net of income tax  benefit)  non-cash  reduction  in the carrying
value of crude oil inventories to reduce such inventories to market resulting in
a $26.1 million  ($15.3 million net of income tax benefit)  inventory  reduction
for the six months ended June 30, 1998.

<PAGE>

NOTE 4:  Computation of Net Income (Loss) Per Share

Basic net  income  (loss) per share is  calculated  as net  income  (loss)  less
preferred  stock  dividends  divided  by the  average  number of  Common  Shares
outstanding.  Diluted  net  income  (loss)  per share  assumes,  when  dilutive,
issuance of the net incremental  shares from stock options and restricted stock,
and conversion of the 5% Cumulative  Convertible Preferred Shares. The following
table  reconciles  the net income  (loss)  amounts and share numbers used in the
computation  of net income (loss) per share (in millions,  except per share data
and number of shares, which are in thousands).
<TABLE>
<CAPTION>
                                                                Three Months Ended         Six Months Ended
                                                                      June 30,                  June 30,
                                                              ---------------------      ---------------------
                                                                 1998        1997          1998         1997
                                                                 ----        ----          ----         ----
                                                              (Restated)               (Restated)
Basic:
<S>                                                            <C>          <C>           <C>          <C>
  Average number of Common Shares outstanding..........         90,220       74,799       88,760        74,762
                                                               =======      =======      =======       =======

  Net (loss) income....................................        $(52.6)      $46.3        $(36.2)       $73.9
    Dividends on 5% Cumulative Convertible Preferred
     Shares............................................              -        1.1           1.1          2.2
                                                               -------      -------      -------       -------
  Net (loss) income applicable to Common Shares........        $(52.6)      $45.2        $(37.3)       $71.7
                                                               =======      =======      =======       =======

Basic net (loss) income per share......................        $(0.58)      $0.60        $(0.42)       $ 0.96
                                                               =======      =======      =======       =======
Diluted:
  Average number of Common Shares outstanding..........         90,220       74,799       88,760        74,762

  Net effect of dilutive stock options and restricted
stock
   based on the treasury stock method using the average              -          995            -           916
   market price for the periods presented..............

  Assumed conversion of 5% Cumulative Convertible
   Preferred Shares (prior to conversion in March 1998)              -        3,319            -         3,319
                                                               -------      -------      -------       --------

        Total..........................................         90,220       79,113       88,760        78,997
                                                               =======      =======      =======       ========

Net (loss) income......................................        $(52.6)      $46.3        $(37.3) (1)   $73.9
                                                               =======      =======      =======       ========

Diluted net (loss) income per share....................        $(0.58)      $0.59        $0.42)        $0.94
                                                               =======      =======      =======       ========
</TABLE>

(1)  Includes dividends on 5% Cumulative Convertible Preferred Shares.

NOTE 5: Redemption of 5% Cumulative Convertible Preferred Shares

The Company's 5% Cumulative  Convertible  Preferred Shares (the Preferred Stock)
included a redemption  feature  effective  through  June 2000,  such that if the
Company's Common Stock traded above $33.77 per share for any 20 days within a 30
day period, the Company could elect to redeem the Preferred Stock by issuance of
Common Stock of the Company.  On February 27, 1998,  the trading  threshold  was
reached and on March 18, 1998 the Company  redeemed  all  1,724,400  outstanding
shares of Preferred  Stock.  The Preferred Shares were redeemed for Common Stock
at a  conversion  rate of  1.9246  shares  of  Common  Stock  for each  share of
Preferred  Stock,  resulting  in a total of  3,318,698  shares of the  Company's
Common Stock being  issued.  The Common  Shares were issued from treasury to the
extent available and the balance were newly issued shares.

NOTE 6:  Commitments and Contingencies

The  Company's  operations  are subject to  environmental  laws and  regulations
adopted by various governmental authorities.  Site restoration and environmental
remediation  and  clean-up  obligations  are  accrued  either when known or when
considered probable and reasonably  estimable.  Total future environmental costs
cannot be reasonably  estimated due to unknown  factors such as the magnitude of
possible contamination,  the timing and extent of remediation, the determination
of the  Company's  liability in  proportion  to other  parties and the extent to
which  environmental  laws and  regulations  may change in the future.  Although
environmental  costs may have a significant  impact on results of operations for
any single year,  the Company  believes that such costs will not have a material
adverse effect on the Company's financial position.

There are various legal  proceedings and claims pending against the Company that
arise in the ordinary course of business. It is management's opinion, based upon
advice of legal counsel,  that these matters,  individually or in the aggregate,
will not have a material adverse effect on the Company's  financial  position or
results of operations.

NOTE 7:  Gain on Sale of Assets

In March 1998,  the Company  recognized  a pre-tax  gain of $7.0  million  ($4.1
million net of income  taxes)  resulting  from the sale of a 25% interest in the
McKee to El Paso pipeline and El Paso terminal to Phillips Petroleum Company.

NOTE 8:  Joint Venture with Petro-Canada

In June 1998, the Company and Petro-Canada  terminated  discussions  relating to
the formation of a refining and marketing joint venture  involving the Company's
Canadian and northern United States operations. The Competition Bureau of Canada
advised  management  of both  companies  that the joint venture  raised  serious
concerns under the  competition  laws of Canada.  In light of these concerns and
the potentially lengthy review process, the project was terminated.  Included in
selling,  general and administrative expenses for the three and six months ended
June 30, 1998 is $11.2 million ($6.6 million net of income tax benefit) of costs
associated  with the joint venture  project  including $2.5 million to write-off
costs for a coker development project that will not be pursued.

NOTE 9:  Joint Venture with Koch Industries, Inc.

In August  1998,  the  Company  and Koch  Hydrocarbon  Co., a  division  of Koch
Industries,  Inc. and Koch Pipeline Co., an affiliate of Koch Industries,  Inc.,
expect to  finalize  the  formation  of a 50-50  joint  venture  related to each
entity's  Mont  Belvieu  petrochemical  assets.  The joint  venture  and related
operating  agreements will require that the Company  contribute its interests in
its  propane/propylene  splitters and related distribution pipeline and terminal
and its interest in its Mont Belvieu  hydrocarbon  storage  facilities  and Koch
will  contribute  its  interest in its Mont  Belvieu  natural  gas  fractionator
facility and certain of its pipeline and supply systems.

<PAGE>

NOTE 10:  Restructuring Charges

In light of increased competitive conditions, in June 1998, the Company approved
a  restructuring  plan designed to reduce its cost structure to reflect  current
values and improve operating efficiencies in its retail marketing,  refining and
pipeline  operations and support services.  As a result,  the Company recorded a
one-time  charge to earnings of $131.6  million ($97.6 million net of income tax
benefit)  for the quarter  ended June 30, 1998 to cover the cost of  eliminating
466  positions,  the closure or sale of 316  convenience  stores and the sale of
certain non-strategic terminals and pipelines.

The components of the $131.6 million charge are as follows (in millions):

         Write-down of property, plant and
           equipment and goodwill (non-cash)...............           $ 82.1
         Severance and related costs.......................             15.5
         Lease buy-out costs...............................             14.1
         Fuel system removal costs.........................             16.7
         Other costs.......................................              3.2
                                                                      ------
                                                                      $131.6
                                                                      ======

The restructuring plan is expected to be completed by the year 2000.

NOTE 11:  Restatement of Financial Statements

As  discussed  in Note 10, the  Company  recorded  a  one-time  charge of $131.6
million to restructure its retail  marketing,  refining and pipeline  operations
and support services.  The previously  reported tax benefit associated with this
restructuring  charge was overstated.  As a result, the Company
has  increased  its  provision  for income taxes by $20.0  million for the three
months and six months ended June 30, 1998.

The effect of this increase in provision for income taxes on previously reported
consolidated  financial  statements as of June 30, 1998 and for the three months
and six months ended June 30, 1998 is as follows (in thousands, except per share
data, unaudited):

                           Consolidated Balance Sheet

                                                     June 30, 1998
                                                     --------------
                                                               Previously
                                                Restated        Reported
                                                --------       ----------
Deferred income taxes.........................   $192.5          $172.5
Retained earnings.............................   $173.2          $193.2

<PAGE>
<TABLE>
<CAPTION> 
                      Consolidated Statements of Operations

                                                       Three Months Ended                Six Months Ended
                                                         June 30, 1998                     June 30, 1998
                                                         -------------                     -------------
                                                                    Previously                       Previously
                                                   Restated          Reported         Restated        Reported
                                                   --------         ----------        --------       ----------
<S>                                                 <C>              <C>               <C>             <C>
(Provision) benefit for income taxes........        $ (0.7)          $ 19.3            $(12.8)         $ 7.2
Net loss....................................        $(52.6)          $(32.6)           $(36.2)         $(16.2)
Basic and diluted net loss per share........        $(0.58)          $(0.36)           $(0.42)         $(0.19)
</TABLE>

                      Consolidated Statement of Cash Flows

                                                    Six Months Ended
                                                      June 30, 1998
                                                      -------------
                                                                 Previously
                                                Restated          Reported
                                                --------         ----------
Net loss...................................      $(36.2)          $(16.2)
Deferred income tax (benefit) provision....      $  4.5           $(15.5)

<TABLE>
<CAPTION>
                  Consolidated Statements of Comprehensive Loss

                                                       Three Months Ended                  Six Months Ended
                                                         June 30, 1998                       June 30, 1998
                                                         -------------                       -------------
                                                                    Previously                         Previously
                                                   Restated          Reported         Restated          Reported
                                                   --------         ----------        --------         ----------
<S>                                                 <C>              <C>               <C>              <C>
Net loss....................................        $(52.6)          $(32.6)           $(36.2)          $(16.2)
Comprehensive loss..........................        $(69.4)          $(49.4)           $(49.3)          $(29.3)
</TABLE>


NOTE 12:  Subsequent Events

On July 13, 1998, the Ardmore Refinery sustained a power failure and fire in the
main fractionation column in the plant's fluid catalytic cracking unit. The unit
is estimated to be down until the last half of September 1998. Repair costs will
be limited to a $1.0 million  insurance  deductible  and  business  interruption
insurance  is  expected to cover all but fifteen  days of lost  operations.  The
Refinery,  which  normally  operates at about  80,000  barrels per day, has been
curtailed to about 37,000 barrels per day.

On July 28, 1998, the Board of Directors approved a $100.0 million stock buyback
plan  allowing  the Company to purchase  shares of its Common  Stock in the open
market.  The purchased  shares will be acquired  through a newly formed  grantor
trust to fund future employee benefit obligations of the Company.

On August 5, 1998,  the Board of  Directors  declared a  quarterly  dividend  of
$0.275 per Common  Share  payable on  September  7, 1998 to holders of record on
August 20, 1998.

<PAGE>

ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION 
          AND RESULTS OF OPERATIONS

The Company
- -----------

Ultramar  Diamond Shamrock  Corporation  (the Company) is a leading  independent
refiner and marketer of petroleum  products and convenience store merchandise in
the Southwest and central regions of the United States (the US System,  formerly
referred  to as the  Southwest),  and the  Northeast  United  States and eastern
Canada (the Northeast  System).  The Company owns and operates seven  refineries
located  in Texas,  California,  Michigan,  Oklahoma,  Colorado  and  Quebec and
markets its products through  Company-operated  convenience stores and wholesale
outlets.  In the US System,  the Company  also  stores and  markets  natural gas
liquids and  polymer-grade  propylene at its  facilities at Mont Belvieu,  Texas
and, in the Northeast System, the Company sells, on a retail basis, home heating
oil.

On September 25, 1997, the Company  completed its acquisition of Total Petroleum
(North America) Ltd. (Total). The purchase price included the issuance of shares
of Company  Common Stock and the  assumption of Total's  outstanding  debt.  The
acquisition has been accounted for using the purchase  method and,  accordingly,
operating  results  of Total  subsequent  to the date of  acquisition  have been
included in the consolidated  statements of operations,  including for the three
and six  months  ended  June 30,  1998.  Total was an  independent  refiner  and
marketer,  operating three  refineries in Michigan,  Oklahoma and Colorado,  and
marketing  its  products  in the  central  region of the United  States  through
company-owned convenience stores and wholesale outlets.

In the Northeast  System,  demand for petroleum  products  varies  significantly
during the year.  Distillate  demand  during the first and fourth  quarters  can
range  from 30% to 40% above the  average  demand  during  the  second and third
quarters.  The  substantial  increase in demand for home  heating oil during the
winter months  results in the Company's  Northeast  System having  significantly
higher  accounts  receivable  and  inventory  levels during the first and fourth
quarters  of each year.  The  Company's  US System is less  affected by seasonal
fluctuations in demand than its operations in the Northeast System.  The working
capital  requirements  of  the  US  System,  though  substantial,   show  little
fluctuation throughout the year.

The  Company's  operating  results  are  affected by  Company-specific  factors,
primarily its refinery utilization rates and refinery  maintenance  turnarounds;
seasonal factors,  such as the demand for petroleum products and working capital
requirements;  and industry factors, such as movements in and the level of crude
oil prices,  the demand for and prices of refined  products and industry  supply
capacity.  The  effect of crude oil price  changes  on the  Company's  operating
results is  determined,  in part,  by the rate at which refined  product  prices
adjust to reflect such changes.  As a result,  the Company's  earnings have been
volatile in the past and may be volatile in the future.

<PAGE>

Results of Operations

Three Months Ended June 30, 1998 Compared to Three Months Ended June 30, 1997

Financial and operating data by geographic  area for the three months ended June
30, 1998 and 1997 are as follows:

Financial Data:
- --------------
<TABLE>
<CAPTION>
                                                                Three Months Ended June 30,
                                                                ---------------------------
                                                    1998                                          1997
                                       --------------------------------          -------------------------------
                                                 (Restated)
                                        U S        Northeast      Total           U S        Northeast     Total
                                        ---        ---------      -----           ---        ---------     -----
                                                                      (in millions)
<S>                                  <C>            <C>         <C>             <C>            <C>        <C>
Sales and other                      $2,442.4       $ 598.6     $3,041.0        $1,716.3       $698.1     $2,414.4
revenues........
Cost of products sold (1).......      1,405.2         321.2      1,726.4         1,081.1        404.7      1,485.8
Operating expenses..............        259.5          28.5        288.0           163.7         28.5        192.2
Selling, general and
    administrative expenses (2).         46.2          48.2         94.4            30.9         38.8         69.7
Taxes other than income taxes...        574.8         183.2        758.0           321.9        198.7        520.6
Depreciation and amortization...         48.9           9.2         58.1            37.6          7.9         45.5
Restructuring charges (3).......        131.6            -         131.6              -            -             -
                                     --------       -------     --------        --------       ------     --------
Operating (loss) income.........     $  (23.8)      $   8.3        (15.5)       $   81.1       $ 19.5        100.6
                                     ========       =======                     ========       ======
Interest income.................                                     2.2                                       5.5
Interest expense................                                   (36.0)                                    (29.6)
                                                                --------                                  --------
(Loss) income before income
    tax provision...............                                   (49.3)                                     76.5
Provision for income taxes......                                    (0.7)                                    (30.2)
Dividend on subsidiary stock....                                    (2.6)                                        -
                                                                --------                                  --------
Net (loss) income...............                                $  (52.6)                                 $   46.3
                                                                ========                                  ========
</TABLE>

1 For the quarter  ended June 30,  1998,  the Company  recorded a $12.5  million
non-cash  reduction in the carrying  value of crude oil  inventories  due to the
continuing drop in crude oil prices.

2 During the second quarter of 1998, the Company incurred $11.2 million in costs
associated with the aborted Petro-Canada joint venture including $2.5 million to
write-off costs for a coker development project that will not be pursued.

3 On June 9, 1998, the Company  recorded a one-time  charge of $131.6 million to
restructure its retail marketing,  refining and pipeline  operations and support
services. The restructuring charges include a property,  plant and equipment and
goodwill  write-down  totaling $82.1 million,  severance and relocation costs of
$15.5  million,  and lease buyout,  fuel system removal and other costs totaling
$34.0 million.

<PAGE>

Operating Data:
- --------------                                           Three Months Ended
                                                               June 30,
                                                               --------
                                                         1998           1997
                                                         ----           ----
US System (formerly the Southwest)

   Mid-Continent Refineries (1)
        Throughput (bpd)                               411,400         236,400
        Margin (dollars per barrel) (2, 4)              $5.03           $5.35

   Wilmington Refinery
        Throughput (bpd)                               121,500         122,800
        Margin (dollars per barrel) (4)                 $5.30           $3.60

   Retail Marketing
        Fuel volume (bpd)                              176,400         108,700
        Fuel margin (cents per gallon (2)               12.5            15.4
        Merchandise sales ($1,000/day)                 $3,258           $2,438
        Merchandise margin (%)                          30.7%            29.9%

Northeast System

   Quebec Refinery
        Throughput (bpd)                               150,100         106,400
        Margin (dollars per barrel) (4)                $2.56            $1.92

   Retail Marketing
        Fuel volume (bpd)                               60,300          60,200
        Overall margins (cents per gallon) (3)           23.7            27.8

(1) The Mid-Continent  Refineries  include the McKee and Three Rivers Refineries
and, since their acquisition on September 25, 1997, the Alma, Ardmore and Denver
Refineries.

(2)  Effective  January 1, 1998,  the  Company  modified  its policy for pricing
refined products  transferred from its McKee and Three Rivers  Refineries to its
Mid-Continent  marketing  operations to more closely  reflect spot market prices
for such refined products.  Accordingly,  the 1997 amounts have been restated to
reflect the pricing  policy change as if it had occurred on January 1, 1997. The
refining  margin and retail  marketing fuel margin  originally  reported for the
quarter ended June 30, 1997 were $5.62 and 13.5 cents respectively.
(3) Retail marketing overall margin reported for the Northeast System represents
a blend of gross  margin for  Company  and dealer  operated  retail  outlets and
convenience stores, home heating oil sales and the cardlock operations.

(4) Refinery  margins for 1998 exclude the impact of the non-cash charge for the
reduction  in the  carrying  value of crude oil  inventories  due to the drop in
crude oil prices.  Had the non-cash charge for the reduction of inventories been
included in the refinery  margin  computation,  the 1998 refinery  margins would
have  been  $5.00 for the  Mid-Continent  Refineries,  $4.61 for the  Wilmington
Refinery, and $2.28 for the Quebec Refinery.

<PAGE>

General

Net loss for the quarter  ended June 30, 1998 totaled  $52.6 million as compared
to net income of $46.3 million for the quarter  ended June 30, 1997.  The second
quarter of 1998 included a one-time  charge of $131.6 million ($97.6 million net
of income tax benefit)  related to the  restructuring  of the retail  marketing,
refining and pipeline  operations and support  services;  $11.2 million of costs
($6.6  million net of income tax  benefit)  associated  with the  aborted  joint
venture with  Petro-Canada;  and a $12.5 million ($7.3 million net of income tax
benefit) non-cash reduction in the carrying value of inventories due to the drop
in crude oil prices.  Excluding these unusual items,  net income would have been
$58.9  million for the quarter  ended June 30, 1998 as compared to $46.3 million
for the quarter ended June 30, 1997.

On a per share basis,  the Company  recognized  a net loss per diluted  share of
$0.58 for the quarter  ended June 30, 1998 as compared to net income per diluted
share of $0.59 in 1997.

In the US System,  the Company had an  operating  loss of $23.8  million for the
second quarter of 1998 as compared to operating  income of $81.1 million for the
second  quarter of 1997.  The decrease in operating  income from 1997 to 1998 is
due to the  unusual  items  discussed  above.  In  addition,  the  Mid-Continent
Refineries'  margin  declined  $0.32 per barrel  coupled with  declining  retail
marketing  fuel margins.  These  decreases  were  partially  offset by increased
throughput from the Mid-Continent Refineries and increased retail marketing fuel
volume, merchandise sales and merchandise margins.

In the  Northeast  System,  operating  income  was $8.3  million  for the second
quarter of 1998 as compared to $19.5 million in the second  quarter of 1997. The
decrease  in  operating  income  from 1997 to 1998 is due to the  unusual  items
discussed above which include a $3.8 million non-cash  reduction in the carrying
value of  inventories  and $9.6  million of costs  associated  with the  aborted
Petro-Canada joint venture.

US System

Sales and other  revenues in the US System in the second quarter of 1998 totaled
$2.4 billion and were 42.3% higher than for the second quarter of 1997 primarily
due to the  increased  sales  generated  from the Total  operations  acquired in
September 1997.  Sales and other revenues for the Total operations for the three
months ended June 30, 1998 were $658.2 million.

The increase in throughput for the Mid-Continent Refineries from 236,400 for the
second quarter of 1997 to 411,400 in the second quarter of 1998 is due mainly to
the increased volume associated with the acquisition of the Alma,  Ardmore,  and
Denver  Refineries  from  Total.  The  refining  margin  for  the  Mid-Continent
Refineries of $5.03 per barrel in the second  quarter of 1998  decreased by 6.0%
as compared to $5.35 per barrel in the second quarter of 1997 mainly because the
decrease in product  selling  prices was greater  than the decrease in crude oil
costs.

Throughput at the  Wilmington  Refinery  remained  relatively  unchanged for the
second quarter of 1998 as compared to the second quarter of 1997.  However,  the
increase  in the  refinery  margin  by 47.2% was a result  of  improved  spreads
between crude oil/feedstocks and refined products.

Retail  marketing  fuel  volume in the US System  increased  by 62.3% to 176,400
barrels  per day as a result of the  addition of  approximately  500 high volume
Total  convenience  stores,  which were  acquired  in  September  1997,  and the
addition of several new  convenience  stores in Colorado and Arizona in the last
quarter of 1997.  Retail fuel margins decreased to 12.5 cents per gallon for the
second  quarter  of 1998  due to  competitive  pricing  pressures  at the  pump,
primarily  in  Texas  and  California.   Merchandise   sales  at  the  Company's
convenience stores increased from $2.4 million per day during the second quarter
of 1997 to $3.3  million  per day during  the second  quarter of 1998 due to the
increased sales generated from the Total stores.  The merchandise margin for the
second quarter of 1998 increased  slightly to 30.7% as compared to 29.9% for the
second  quarter of 1997 as a result of beer price wars in Texas  which  affected
margins negatively in 1997.

The  petrochemicals  and natural gas liquids  business  contributed to operating
income,  however at lower levels in 1998 as compared to 1997 due to the negative
impact on  prices of  propylene  and  other  petrochemicals  caused by very weak
economic  conditions  in Asia and the Far East.  Consequently,  the  Company has
canceled plans to construct a cyclohexane  plant at the Three Rivers Refinery in
South Texas.

Selling,  general and  administrative  expenses  of $46.2  million in the second
quarter of 1998 were $15.3  million  higher than in the second  quarter of 1997,
reflecting  primarily  higher  selling  costs  incurred to support the increased
sales  resulting  from the Total  operations  and $1.6 million of costs incurred
related to the formation of the aborted Petro-Canada joint venture.

Northeast System

Sales and other  revenues in the Northeast  System in the second quarter of 1998
totaled  $598.6  million  and were $99.5  million,  or 14.3%,  lower than in the
corresponding  quarter  of 1997,  as a result of lower  sales in the  retail and
wholesale  segments  following the relatively  mild winter in Eastern Canada and
the Northeast United States.  The lower sales were also directly affected by the
reduced  1998  selling  prices of refined  products in  comparison  to 1997 as a
result of lower crude oil prices.

Throughput at the Quebec Refinery increased 41.1% to 150,100 barrels per day for
the second  quarter of 1998  compared to 106,400  barrels per day for the second
quarter of 1997. The low throughput in 1997 was caused by a planned  maintenance
turnaround on the fluid catalytic  cracking unit in May and June 1997.  Refining
margins  increased by 33.3% to $2.56 per barrel in the second quarter of 1998 as
compared  to $1.92 per  barrel in the  second  quarter of 1997 due mainly to the
scheduled refinery  maintenance  turnaround which occurred in the second quarter
of 1997.

Retail marketing fuel volumes remained level as compared with the second quarter
of 1997 at  approximately  60,300  barrels  per day.  Retail  margins,  however,
dropped to 23.7 cents per gallon in 1998 as compared to 27.8 cents per gallon in
1997 due to the decreased demand for high-margin home heating oil resulting from
a mild  winter in 1998 which was  partially  offset by  increased  demand in the
lower-margin motorist and cardlock markets.

Selling,  general and administrative expenses of $48.2 million were $9.4 million
higher than in the second  quarter of 1997  principally  due to $9.6  million of
costs  incurred  related to the  formation  of the  aborted  Petro-Canada  joint
venture.

Corporate

Interest expense of $36.0 million in the second quarter of 1998 was $6.4 million
higher  than  in  the  corresponding  quarter  of  1997  due to  higher  average
borrowings  in 1998 as  compared  to 1997  resulting  from the debt  incurred to
finance the Total acquisition in September 1997.

The consolidated income tax provision,  exclusive of the restructuring  charges,
for the second quarter of 1998 was based upon the Company's  estimated effective
income tax rate for the year ending  December 31, 1998 of 41.3%.  The income tax
benefit of the restructuring charges was computed separately at 25.9%, resulting
in a 1.4%  effective  income tax rate for the quarter  ended June 30, 1998.  The
income tax rate on the restructuring charges is below the U.S. Federal statutory
income tax rate due to the non-deductible writedown of goodwill.

The  consolidated  income tax provision for the second quarter of 1997 was based
upon the  Company's  estimated  effective  income  tax  rate for the year  ended
December 31, 1997 of 39.5%. The  consolidated  effective income tax rate exceeds
the U.S.  Federal  statutory income tax rate primarily due to state income taxes
and the effects of foreign operations.

<PAGE>

Six Months Ended June 30, 1998 Compared to Six Months Ended June 30, 1997

Financial  and operating  data by geographic  area for the six months ended June
30, 1998 and 1997 are as follows:
<TABLE>
<CAPTION>
Financial Data:
                                                           Six Months Ended June 30,
                                   --------------------------------------------------------------------------------
                                                  1998                                       1997
                                   --------------------------------------       -----------------------------------
                                                                       (Restated)
                                        U S        Northeast      Total           U S        Northeast     Total
                                        ---        ---------      -----           ---        ---------     -----
                                                                       (in millions)
<S>                                  <C>           <C>          <C>             <C>          <C>          <C>
Sales and other revenues........     $4,575.2      $1,255.4     $5,830.6        $3,448.4     $1,516.2     $4,964.6
Cost of products sold (1).......      2,661.2         686.5      3,347.7         2,226.5        909.0      3,135.5
Operating expenses..............        516.5          59.4        575.9           341.1         61.3        402.4
Selling, general and
    administrative expenses (2).         84.5          88.5        173.0            60.6         81.1        141.7
Taxes other than income taxes...      1,074.6         361.7      1,436.3           641.7        388.1      1,029.8
Depreciation and amortization...        105.4          18.1        123.5            74.5         15.2         89.7
Restructuring charges (3).......        131.6             -        131.6               -            -            -
                                     --------      --------     --------        --------     --------     --------
Operating income................     $    1.4      $   41.2         42.6        $  104.0     $   61.5        165.5
                                     ========      ========                     ========     ========
Interest income.................                                     4.3                                       7.9
Interest expense................                                   (72.1)                                    (62.1)
Gain on sale of assets (4)......                                     7.0                                      11.0
                                                                --------                                  --------
(Loss) income before income
    tax provision...............                                   (18.2)                                    122.3
Provision for income taxes......                                   (12.8)                                    (48.4)
Dividend on subsidiary stock....                                    (5.2)                                        -
                                                                --------                                  --------
Net (loss) income...............                                $  (36.2)                                 $   73.9
                                                                ========                                  ========
</TABLE>

(1) During the six months  ended June 30,  1998,  the  Company  recorded a $26.1
million non-cash reduction in the carrying value of crude oil inventories due to
the significant drop in crude oil prices in 1998.

(2) During the second  quarter of 1998,  the Company  incurred  $11.2 million in
costs  associated  with the aborted  Petro-Canada  joint venture  including $2.5
million to  write-off  costs for a coker  development  project  that will not be
pursued.

(3) On June 9, 1998, the Company recorded a one-time charge of $131.6 million to
restructure its retail marketing,  refining and pipeline  operations and support
services. The restructuring charges include a property,  plant and equipment and
goodwill  write-down  totaling $82.1 million,  severance and relocation costs of
$15.5  million,  and lease buyout,  fuel system removal and other costs totaling
$34.0 million.

(4 In March 1998,  the Company  recognized  a $7.0 million gain on the sale of a
25% interest in its McKee to El Paso  pipeline and El Paso  terminal to Phillips
Petroleum  Company.  In March 1997, the Company recognized an $11.0 million gain
on the sale of an office building in San Antonio, Texas.

<PAGE>

Operating Data:
                                                       Six Months Ended
                                                           June 30,
                                                           --------
                                                   1998             1997
                                                   ----             ----
US System (formerly the Southwest)

   Mid-Continent Refineries (1)
        Throughput (bpd)                           406,800           229,600
        Margin (dollars per barrel) (2, 4)          $4.30             $4.93

   Wilmington Refinery
        Throughput (bpd)                           122,700           113,900
        Margin (dollars per barrel) (4)             $5.06             $4.25

   Retail Marketing
        Fuel volume (bpd)                          171,800           105,000
        Fuel margin (cents per gallon) (2)          13.1              13.0
        Merchandise sales ($1,000/day)              $3,090            $2,255
        Merchandise margin (%)                       30.7%             30.0%

Northeast System

   Quebec Refinery
        Throughput (bpd)                           153,300           127,400
        Margin (dollars per barrel) (4)             $2.39             $2.24

   Retail Marketing
        Fuel volume (bpd)                           65,100            65,400
        Overall margins (cents per gallon) (3)       26.6              28.5

(1) The Mid-Continent  Refineries  include the McKee and Three Rivers Refineries
and, since their acquisition on September 25, 1997, the Alma, Ardmore and Denver
Refineries.

(2)  Effective  January 1, 1998,  the  Company  modified  its policy for pricing
refined products  transferred from its McKee and Three Rivers  Refineries to its
Mid-Continent  marketing  operations to more closely  reflect spot market prices
for such refined products.  Accordingly,  the 1997 amounts have been restated to
reflect the pricing  policy change as if it had occurred on January 1, 1997. The
refining margin and retail marketing fuel margin originally reported for the six
months ended June 30, 1997, were $5.23 and 11.4 cents, respectively.

(3) Retail marketing overall margin reported for the Northeast System represents
a blend of gross  margin for  Company  and dealer  operated  retail  outlets and
convenience stores, home heating oil sales and the cardlock operations.

(4) Refinery  margins for 1998 exclude the impact of the non-cash charge for the
reduction  in the  carrying  value of crude oil  inventories  due to the drop in
crude oil prices.  Had the non-cash charge for the reduction of inventories been
included in the refinery  margin  computation,  the 1998 refinery  margins would
have  been  $4.19 for the  Mid-Continent  Refineries,  $4.72 for the  Wilmington
Refinery, and $2.01 for the Quebec Refinery.

<PAGE>

General

Net loss for the six  months  ended  June 30,  1998  totaled  $36.2  million  as
compared to net income of $73.9  million for the six months ended June 30, 1997.
The first six months of 1998 included a $7.0 million ($4.1 million net of income
taxes) gain on the sale of a 25%  interest in the McKee to El Paso  pipeline and
El Paso  terminal;  a $26.1  million  ($15.3  million net of income tax benefit)
non-cash  charge to reduce crude oil  inventories  due to the continuing drop in
crude oil prices;  a one-time  charge of $131.6  million  ($97.6  million net of
income tax  benefit)  related  to the  restructuring  of the  retail  marketing,
refining and pipeline  operations  and support  services;  and $11.2  million of
costs ($6.6 million net of income tax benefit) associated with the aborted joint
venture  with  Petro-Canada.  In the  first  six  months  of 1997,  the  Company
recognized  an $11.0 million ($6.6 million net of income taxes) gain on the sale
of an office building. Excluding these unusual items, net income would have been
$79.2  million  for the six months  ended  June 30,  1998 as  compared  to $67.3
million for the six months ended June 30, 1997.

As a result of these unusual items,  for the six months ended June 30, 1998, the
Company recognized a net loss of $0.42 per basic share as compared to net income
of $0.96 per basic  share in 1997.  The net loss per  diluted  share for the six
months ended June 30, 1998 was also $0.42 as compared to net income of $0.94 per
diluted share in 1997.

In the US System, the Company had operating income of $1.4 million for the first
six months of 1998 as compared  to  operating  income of $104.0  million for the
same period of 1997. In the Northeast System, operating income was $41.2 million
for the first six  months of 1998 as  compared  to $61.5  million  in 1997.  The
decrease  in  operating  income from 1997 to 1998 for both the US System and the
Northeast System is due primarily to the unusual items discussed above.

US System

Sales and other revenues in the US System for the six months ended June 30, 1998
totaled  $4.6  billion and were 32.7%  higher than for the six months ended June
30,  1997  primarily  due  to the  increased  sales  generated  from  the  Total
operations  acquired in September  1997.  Sales and other revenues for the Total
operations  for the six months ended June 30, 1998 were $1.3 billion.  Sales and
other revenues were adversely impacted by lower sales prices of products in 1998
as compared to 1997 as a result of the overall  market  decline in crude oil and
refined product prices.

The increase in throughput for the Mid-Continent  Refineries from 229,600 in the
first  half of 1997 to  406,800  in the first  half of 1998 is due mainly to the
increased volume  associated with the acquisition of the Total  refineries.  The
refining  margin  for the  Mid-Continent  Refineries  of $4.30 per barrel in the
first six months of 1998  decreased  by 12.8% as compared to $4.93 per barrel in
the first six months of 1997 due to a 21-day scheduled maintenance turnaround at
the Three Rivers Refinery,  lower throughput at the Ardmore Refinery in order to
de-bottleneck  the crude unit,  and an unplanned  repair of the fluid  catalytic
cracking  unit at the  McKee  Refinery.  In  addition,  product  selling  prices
decreased by more than the decrease in crude oil costs.

Throughput at the  Wilmington  Refinery  increased 7.7% for the six months ended
June 30, 1998 to 122,700 barrels per day because of increased  purchases of high
sulfur  distillate  to produce  finished  diesel during 1998 which did not occur
during the first half of 1997 coupled with a scheduled maintenance turnaround on
the gas oil hydrotreater in February 1997 which impacted  throughput in 1997. In
addition,  the increase in the refining margin by 19.1% was a result of improved
spreads between crude oil/feedstocks and refined products.

<PAGE>

Retail  marketing  fuel  volume in the US System  increased  by 63.6% to 171,800
barrels per day, as a result of the  addition of  approximately  500 high volume
Total  convenience  stores,  which were  acquired  in  September  1997,  and the
addition of several new  convenience  stores in Colorado and Arizona in the last
quarter of 1997.  Retail fuel margins  remained  steady for the six months ended
June 30, 1998 as compared to 1997 at 13.1 cents per gallon.

Merchandise  sales at the  Company's  convenience  stores  increased  from  $2.3
million  per day  during the first six  months of 1997 to $3.1  million  per day
during the first six months of 1998 due to the increased  sales  generated  from
the Total stores.  The merchandise margin for the six months ended June 30, 1998
was up slightly at 30.7% as compared to 30.0% for the six months  ended June 30,
1997.

For the first six months of 1998,  the  petrochemicals  and  natural gas liquids
businesses  contributed to operating income,  however at lower levels due to the
declining  prices  of  propylene  and  other   petrochemicals  which  have  been
negatively impacted by very weak economic conditions in Asia and the Far East.

Selling, general and administrative expenses of $84.5 million for the six months
ended June 30, 1998 were $23.9 million higher than the six months ended June 30,
1997,  primarily due to higher  selling costs  incurred to support the increased
sales  resulting  from the Total  operations,  $1.6  million  of costs  incurred
related  to  the  formation  of  the  aborted  Petro-Canada  joint  venture  and
approximately $3.5 million of non-recurring costs associated with Total's Denver
office which was closed in May 1998.

Northeast System

Sales and other revenues in the Northeast System in the first six months of 1998
totaled  $1.3  billion  and were  $260.8  million,  or 17.2%,  lower than in the
corresponding  six months of 1997,  as a result of lower sales in the retail and
wholesale  segments  following the relatively  mild winter in Eastern Canada and
the Northeast United States.  The lower sales were also directly affected by the
reduced  1998  selling  prices of refined  products in  comparison  to 1997 as a
result of the lower crude oil prices.

Throughput at the Quebec Refinery  increased 20.3% to 153,300 barrels per day in
the first six months of 1998  compared  to 127,400  barrels per day in the first
six  months  of  1997.  The low  throughput  in 1997  was  caused  by a  planned
maintenance  turnaround  on the fluid  catalytic  cracking  unit in May and June
1997.  Refining  margins  increased by 6.7% to $2.39 per barrel in the first six
months of 1998 as  compared  to $2.24 per barrel in the first six months of 1997
due mainly to the scheduled  refinery  maintenance  turnaround which occurred in
the second quarter of 1997.

Retail  marketing  fuel volumes  remained  level as compared  with the first six
months of 1997 at approximately 65,000 barrels per day. Retail margins, however,
dropped to 26.6 cents per gallon in 1998 as compared to 28.5 cents per gallon in
1997 due to the decreased demand for high-margin home heating oil resulting from
a mild  winter in 1998 which was offset  partially  by  increased  demand in the
lower-margin motorist and cardlock markets.

Selling,  general and administrative  expenses of $88.5 million were higher than
in the  first six  months  of 1997,  principally  due to $9.6  million  of costs
incurred related to the formation of the aborted Petro-Canada joint venture.

<PAGE>

Corporate

Interest  expense  of $72.1  million  in the first six  months of 1998 was $10.0
million  higher  than in the  corresponding  six  months  of 1997 due to  higher
average  borrowings in 1998 as compared to 1997 resulting from the debt incurred
to finance the acquisition of Total in September 1997.

The consolidated income tax provision,  exclusive of the restructuring  charges,
for the six months  ended June 30, 1998 was based upon the  Company's  estimated
effective  income tax rate for the year ending  December 31, 1998 of 41.3%.  The
income tax benefit of the  restructuring  charges  was  computed  separately  at
25.9%,  resulting in a 70.3% effective  income tax rate for the six months ended
June 30,  1998.  The income tax rate on the  restructuring  charges is below the
U.S. Federal  statutory income tax rate due to the  non-deductible  writedown of
goodwill.

The consolidated income tax provision for the six months ended June 30, 1997 was
based upon the Company's  estimated effective income tax rate for the year ended
December 31, 1997 of 39.5%. The  consolidated  effective income tax rate exceeds
the U.S.  Federal  statutory income tax rate primarily due to state income taxes
and the effects of foreign operations.

Outlook
- -------

The Company's  earnings depend largely on refining and retail marketing margins.
The  petroleum  refining and  marketing  industry  has been and  continues to be
volatile and highly competitive.  The cost of crude oil purchased by the Company
as well as the price of refined  products  sold by the Company  have  fluctuated
widely in the past.  As a result of the  historic  volatility  of  refining  and
marketing  margins  and the fact  that they are  affected  by  numerous  diverse
factors, it is impossible to predict future margin levels.

Crude oil prices held  relatively  low  throughout  the first part of the second
quarter of 1998 then dropped  significantly  in early June. A meeting among OPEC
members in late June 1998, in which they resolved to cut  production,  worked to
temporarily  halt the skid in prices  until  mid-August  when actual  production
cutbacks were not as large as promised.  Until all major oil-producing countries
(OPEC and non-OPEC) cut  production,  it is expected that prices will remain low
in the short-term. Any significant rise in crude oil prices will put pressure on
margins and may impact  profitability in the third quarter of 1998. However, the
significant  time  lag  between  crude  oil  purchases  and  deliveries  to  the
Mid-Continent  Refineries  (about 40 days)  should  result  in  higher  refining
margins for these refineries if crude oil prices rise sharply.

The  Company  enjoyed  strong  margins  in the  second  quarter  throughout  its
operations.  These  margins have carried over into the third  quarter;  however,
refining margins have declined in early August 1998 as a result of pressure from
high  inventories  and  softened  demand  as a result  of the end of the  summer
driving season.

As the Company begins the third quarter,  all facilities are operating extremely
well,  with the  exception of the Ardmore  Refinery  which  experienced  a power
failure  and  fire in the  main  fractionation  column  of the  fluid  catalytic
cracking  unit on July 13, 1998.  The unit is expected to be down until the last
half of  September;  however,  repair  costs will be  limited to a $1.0  million
insurance  deductible and business  interruption  insurance is expected to cover
all but  fifteen  days of lost  operations.  The  remainder  of the  refinery is
operating at 37,000 barrels per day.

See "Certain Forward Looking Statements."

Capital Expenditures
- --------------------

The  refining  and  marketing  of  petroleum  products  is a  capital  intensive
business.  Significant capital  requirements  include expenditures to upgrade or
enhance refinery  operations to meet environmental  regulations and maintain the
Company's  competitive  position,  as well as to  acquire,  build  and  maintain
broad-based  retail  networks.   The  capital   requirements  of  the  Company's
operations  consist  primarily of (i) reliability,  environmental and regulatory
expenditures,  such as those  required to  maintain  equipment  reliability  and
safety and to address  environmental  regulations  (including  reformulated fuel
specifications,  stationary  source emission  standards and underground  storage
tank  regulations);  and (ii)  growth  opportunity  expenditures,  such as those
planned to expand and upgrade its retail  marketing  business,  to increase  the
capacity of certain  refinery  processing  units and  pipelines and to construct
additional petrochemical processing units.

During the six months ended June 30, 1998,  capital  expenditures  totaled $64.9
million, of which $32.5 million related to growth opportunity expenditures,  and
$32.4 million related to reliability, environmental and regulatory expenditures.
Approximately  $16.3  million  and  $8.8  million  have  been  incurred  at  the
refineries  and  the  retail  level,  respectively,   for  various  reliability,
environmental and regulatory expenditures.

Growth  opportunity  spending during the first six months of 1998 included $12.7
million  for the  construction  of a  third  propane/propylene  splitter  at the
Company's Mont Belvieu facility to be completed in August 1998, and $2.9 million
for the McKee to El Paso  pipeline  expansion  to  increase  capacity  to 60,000
barrels per day. Upon completion of the expansion, this cost will be shared with
Phillips  Petroleum  Company,  a partner  whose  interest in the  pipeline  will
increase  from 25% to 33% as a  result.  In May  1998,  three  additional  water
cooling tower bays were completed at the McKee Refinery for a total cost of $1.8
million  to  alleviate  the  shortage  of cooling  water to the fluid  catalytic
cracking unit and other units and to increase operating efficiency. At the Three
Rivers Refinery, the fluid catalytic cracker unit's reactor and regenerator were
replaced with new state-of-the-art designs, and new exchangers, pumps and towers
were installed in the gas  concentration  and Merox treating units.  This revamp
work cost  approximately $2.1 million and has increased  throughput  capacity of
the Three Rivers Refinery by  approximately  2,000 barrels per day. Through June
1998, approximately $1.3 million has been incurred to modify the main column and
gas  concentration  sections  of  the  fluid  catalytic  cracking  unit  at  the
Wilmington  Refinery to expand throughput capacity by 5,000 barrels per day. The
project is expected to be completed in December 1998 at a total  estimated  cost
of $13.0 million.

During the six months  ended June 30,  1998,  the Company  also  incurred  $21.1
million in maintenance  turnaround costs primarily at the Ardmore,  Three Rivers
and McKee Refineries.

The  Company  is  continually  investigating  strategic  acquisitions  and other
business opportunities,  some of which may be material, that will complement its
current business activities.

The Company expects to fund its capital expenditures over the next several years
from cash provided by operations and, to the extent necessary, from the proceeds
of borrowings  under its bank credit  facilities  and its  commercial  paper and
medium-term  note programs  discussed  below.  In addition,  depending  upon its
future needs and the cost and  availability of various  financing  alternatives,
the Company may, from time to time, seek additional debt or equity  financing in
the public or private markets.

<PAGE>

Liquidity and Capital Resources
- -------------------------------

As of June 30,  1998,  the  Company  had cash and  cash  equivalents  of  $112.5
million.  The Company  currently has two committed,  unsecured  bank  facilities
which  provide a maximum of $700.0  million  U.S.  and $200.0  million  Cdn.  of
available credit, and a $700.0 million commercial paper program supported by the
committed, unsecured U.S. bank facility.

As of June 30, 1998,  the Company had  approximately  $518.2  million  remaining
borrowing  capacity  under its committed bank  facilities  and commercial  paper
program.  In addition to its committed  bank  facilities,  on June 30, 1998, the
Company  had   approximately   $514.8   million  of  borrowing   capacity  under
uncommitted,  unsecured  short-term  lines  of  credit  with  various  financial
institutions.

In  addition  to its bank  credit  facilities,  the  Company  has  $1.0  billion
available  under  universal  shelf  registrations   previously  filed  with  the
Securities  and Exchange  Commission.  The net proceeds  from any debt or equity
offering  under the  universal  shelf  registrations  would add to the Company's
working capital and would be available for general corporate purposes.

The  Company  also has $73.8  million  available  pursuant  to  committed  lease
facilities aggregating $355.0 million, under which the lessors will construct or
acquire and lease to the Company primarily convenience stores.

The bank facilities and other debt agreements  require that the Company maintain
certain  financial  ratios and other  restrictive  covenants.  The Company is in
compliance  with such covenants and believes that such covenants will not have a
significant  impact on the Company's  liquidity or its ability to pay dividends.
The Company  believes its current sources of funds will be sufficient to satisfy
its capital expenditure, working capital, debt service and dividend requirements
for at least the next twelve months.

In March  1998,  the  Company  exercised  its  right  to  redeem  the  1,724,400
outstanding shares of its 5% Cumulative  Convertible Preferred Stock into Common
Stock at a  conversion  rate of 1.9246  shares of Common Stock for each share of
Preferred  Stock.  The redemption  resulted in 3,318,698  shares of Common Stock
being issued,  a portion of which came from  treasury  shares and the balance of
shares  were newly  issued.  As a result of the  redemption,  the cash  dividend
requirements  for the  Company  will be lower by $0.7  million on an  annualized
basis.

The continued  consolidation in the refining and marketing  industry has changed
the retail  product  pricing  environment  resulting in lower  retail  marketing
margins over the past several years.  In order to stay  competitive and increase
profitability,  the Company  initiated a  restructuring  program in June 1998 to
reorganize its retail support  infrastructure  (eliminating  341 positions),  to
close or sell  316  under-performing  convenience  stores,  and to sell  certain
excess terminal and pipeline assets,  including the elimination of an additional
125 positions.  Accordingly,  the Company recognized a one-time charge of $131.6
million  in the  quarter  ended June 30,  1998  consisting  of $82.1  million to
write-down property,  plant and equipment and goodwill,  $34.0 million for costs
associated  with closing the 316  convenience  stores,  and of $15.5  million of
severance costs to eliminate 466 positions.

The  restructuring  initiatives  are expected to increase annual earnings before
interest and income taxes by $99.6 million in 1999,  $124.0 million in 2000, and
$128.9  million in 2001 due to lower  operating  costs.  The  increase in annual
earnings  will more  than  offset  the  one-time  cash  outlays  related  to the
restructuring  program  estimated at $49.5 million over the next three years. In
addition,  as part of the  restructuring  plan,  the Company has  decreased  its
retail  marketing  capital  expenditures  budget by $32.6 million for the second
half of 1998.

On July 28, 1998, the Board of Directors approved a $100.0 million stock buyback
plan  allowing  the Company to purchase  shares of its Common  Stock in the open
market.  The Company will fund the purchase of Common Stock using available cash
flow and existing  debt  facilities.  The  purchased  stock will be used to fund
future employee benefit obligations of the Company.

On August 5, 1998,  the Board of  Directors  declared a  quarterly  dividend  of
$0.275 per Common  Share  payable on  September  7, 1998 to holders of record on
August 20, 1998.

Cash Flows for the Six Months Ended June 30, 1998

During the six months ended June 30, 1998, the Company's cash position increased
$20.5  million to $112.5  million.  Net cash  provided by  operating  activities
during the first half of 1998 was $98.5  million due to  increased  depreciation
and  amortization,  the $82.1  million  restructuring  charges  write-down,  and
management's  efforts to reduce  accounts  and notes  receivable  and  inventory
levels,  which were offset by reductions  in accounts  payable and other current
liabilities.

Net cash used in investing activities during the six months ended June 30, 1998,
totaled  $37.8  million,  including  cash  outflows of $64.9 million for capital
expenditures  and $21.1  million  for  maintenance  turnaround  costs,  and cash
inflows of $27.8  million  related to proceeds  from the sale of the McKee to El
Paso  pipeline  and El Paso  terminal  to Phillips  Petroleum  Company and $17.2
million for proceeds from the sale of 29 convenience stores to Griffin L.L.C.

Net cash used in financing activities during the six months ended June 30, 1998,
totaled $39.9  million,  primarily due to the cash  dividends  declared and paid
totaling  $49.7  million on  outstanding  Common  Stock ($0.55 per share) and 5%
Cumulative Convertible Preferred Stock ($0.625 per share) prior to redemption in
March 1998.

Exchange Rates
- --------------

The value of the  Canadian  dollar  relative  to the U.S.  dollar  has  weakened
substantially  since the  acquisition  of the Canadian  operations in 1992,  and
reached an historic low against the U.S.  dollar in the second  quarter of 1998.
As the Company's  Canadian  operations are in a net asset  position,  the weaker
Canadian dollar has reduced,  in U.S. dollars,  the Company's net equity at June
30, 1998, by $91.3  million.  Although the Company  expects the exchange rate to
fluctuate during 1998, it cannot reasonably predict its future movement.

With the exception of its crude oil costs,  which are U.S.  dollar  denominated,
fluctuations  in the Canadian  dollar  exchange rate will affect the U.S. dollar
amount of  revenues  and related  costs and  expenses  reported by the  Canadian
operation. The potential impact on refining margin of fluctuating exchange rates
together  with U.S.  dollar  denominated  crude oil  costs is  mitigated  by the
Company's pricing policies in the Northeast System,  which generally pass on any
change in the cost of crude oil. Marketing margins, on the other hand, have been
adversely affected by exchange rate fluctuations as competitive  pressures have,
from  time to time,  limited  the  Company's  ability  to  promptly  pass on the
increased  costs to the ultimate  consumer.  The Company has considered  various
strategies to manage  currency  risk,  and it hedges the Canadian  currency risk
when such hedging is considered economically appropriate.

Update on Impact of Year 2000 Issues
- ------------------------------------

In June 1998, the Company terminated its efforts to form a joint venture between
its Northeast  operations and Petro-Canada's  refining and marketing  operations
and, accordingly,  has revised the plans by which it will bring its Northeast IT
systems  into  compliance  for  the  year  2000.  The  revised  plan  calls  for
implementing new stand-alone IT systems in the Northeast operations,  which will
provide  enhanced   business   benefits  in  addition  to  providing  year  2000
compliance.  The Company has not yet determined the cost of the new  stand-alone
IT systems,  however it is expected to be higher than previously planned for the
Petro-Canada joint venture. The Company's revised plan anticipates having new IT
systems implemented during the third quarter of 1999.

New Accounting Pronouncements
- -----------------------------

In April 1998, the American  Institute of Certified  Public  Accountants  issued
Statement  of  Position  (SOP) No.  98-5,  "Reporting  on the Costs of  Start-Up
Activities."  SOP 98-5 revises existing  standards,  requiring that all start-up
activity costs be expensed as incurred.  The term  "start-up" is broadly defined
and includes pre-operating,  pre-opening and organizational activities. SOP 98-5
is effective for financial  statements for periods  beginning after December 15,
1998; however early adoption is permitted. The Company expects to adopt SOP 98-5
as of January 1, 1999 and is currently evaluating the impact of the change which
is not expected to be material to the Company.

In June 1998,  the  Financial  Accounting  Standards  Board issued SFAS No. 133,
"Accounting  for Derivative  Instruments and Hedging  Activities."  SFAS No. 133
establishes   new  and  revises  several   existing   standards  for  derivative
instruments,   including  certain  derivative   instruments  embedded  in  other
contracts,  and hedging  activities.  It requires  that an entity  recognize all
derivatives  as either  assets or  liabilities  in the balance sheet and measure
such instruments at fair value. If certain  conditions are met, a derivative may
be  designated  as a  cashflow  hedge,  as a fair  value  hedge or as a  foreign
currency hedge.  An entity that elects to apply hedge  accounting is required to
establish at the inception of the hedge the method it will use for assessing the
effectiveness of the hedge and the measurement method to be used. Changes in the
fair value of  derivatives  are either  recognized  in earnings in the period of
change or as a component  of other  comprehensive  income in the case of certain
hedges.  SFAS No. 133 is  effective  for all  fiscal  quarters  of fiscal  years
beginning  after June 15, 1999. The Company  expects to adopt SFAS No. 133 as of
January 1, 2000 and is currently  evaluating  the impact of the change,  but has
not quantified the effect at this time.

Certain Forward Looking Statements
- ----------------------------------

This quarterly report on Form 10-Q contains certain "forward-looking" statements
as such term is defined in the U. S. Private Securities Litigation Reform Act of
1995 and information relating to the Company and its subsidiaries that are based
on the beliefs of  management  as well as  assumptions  made by and  information
currently  available  to  management.  When  used  in  this  report,  the  words
"anticipate," "believe," "estimate," "expect," and "intend" and words or phrases
of  similar  import,  as they  relate  to the  Company  or its  subsidiaries  or
management,  identify  forward-looking  statements.  Such statements reflect the
current  views of  management  with respect to future  events and are subject to
certain  risks,  uncertainties  and  assumptions  relating to the operations and
results of operations,  including as a result of competitive factors and pricing
pressures,  shifts in market demand and general  economic  conditions  and other
factors.

Should one or more of these risks or  uncertainties  materialize,  or should any
underlying  assumptions  prove  incorrect,  actual  results or outcomes may vary
materially from those  described  herein as  anticipated,  believed,  estimated,
expected or intended.

PART II.  OTHER INFORMATION

ITEM 1.   LEGAL PROCEEDINGS

         None..............

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

         (a)......Exhibits

                  27.1  Financial Data Schedule

         (b)      Reports on Form 8-K

                  None.

SIGNATURE

Pursuant to the  requirements of section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the Company has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized.


ULTRAMAR DIAMOND SHAMROCK CORPORATION
(Registrant)



By:  /s/ H. PETE SMITH
         H. PETE SMITH
         EXECUTIVE VICE PRESIDENT
         AND CHIEF FINANCIAL OFFICER
         October 28, 1998

<TABLE> <S> <C>

<ARTICLE>                5
<MULTIPLIER>             1,000
       
<S>                      <C>
<PERIOD-TYPE>                                  6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-END>                                   JUN-30-1998
<CASH>                                             112,500
<SECURITIES>                                             0
<RECEIVABLES>                                      599,000
<ALLOWANCES>                                       (15,100)
<INVENTORY>                                        622,100
<CURRENT-ASSETS>                                 1,405,700
<PP&E>                                           4,618,200
<DEPRECIATION>                                  (1,190,900)
<TOTAL-ASSETS>                                   5,221,200
<CURRENT-LIABILITIES>                              975,800
<BONDS>                                          1,869,000
                              200,000
                                              0
<COMMON>                                               900
<OTHER-SE>                                       1,593,100
<TOTAL-LIABILITY-AND-EQUITY>                     5,221,200
<SALES>                                          5,830,600
<TOTAL-REVENUES>                                 5,830,600
<CGS>                                            3,347,700
<TOTAL-COSTS>                                    3,347,700
<OTHER-EXPENSES>                                 2,433,400
<LOSS-PROVISION>                                     6,900
<INTEREST-EXPENSE>                                  72,100
<INCOME-PRETAX>                                    (18,200)
<INCOME-TAX>                                        12,800
<INCOME-CONTINUING>                                (36,200)
<DISCONTINUED>                                           0
<EXTRAORDINARY>                                          0
<CHANGES>                                                0
<NET-INCOME>                                       (36,200)
<EPS-PRIMARY>                                        (0.42)
<EPS-DILUTED>                                        (0.42)
        

</TABLE>


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