WISER OIL CO
SC 13G, 1998-07-06
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                                 SCHEDULE 13G

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934



                             The Wiser Oil Company
                             ---------------------
                               (Name of Issuer)

                                 Common Stock
                                 ------------
                        (Title of Class of Securities)

                                  977284 10 8
                                  -----------
                                (CUSIP Number)



                                 June 26, 1998
            -------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
                                   is filed:

                              [   ] Rule 13d-1(b)
                              [ X ] Rule 13d-1(c)
                              [   ] Rule 13d-1(d)

                                  Page 1 of 7
<PAGE>
 
  SCHEDULE 13G

- --------------------------------------------------------------------------------
  CUSIP No. 977284 10 8
            -----------

- --------------------------------------------------------------------------------
  1)  Name of Reporting Persons
      I.R.S. Identification Nos. of above persons (entities only)

      Cross Timbers Oil Company
      -------------------------
      75-2347769
      ----------
- --------------------------------------------------------------------------------
  2)  Check the Appropriate Box if a Member of a Group 
      (See Instructions)                                 a) [   ]  b) [   ]

- --------------------------------------------------------------------------------
  3)  SEC Use Only

- --------------------------------------------------------------------------------
  4)  Citizenship or Place of Organization
      Delaware
      --------
- --------------------------------------------------------------------------------

                            5)  Sole Voting Power
   Number of Shares             250,000
   Beneficially Owned by        -------
   Each Reporting Person    ----------------------------------------------------
   With                     6)  Shared Voting Power
                                525,000*
                                -------
                            ----------------------------------------------------
                            7)  Sole Dispositive Power
                                250,000
                                -------
                            ----------------------------------------------------
                            8)  Shared Dispositive Power
                                525,000*
                                -------
- --------------------------------------------------------------------------------
  9)  Aggregate Amount Beneficially Owned by Each Reporting Person
      775,000**
      -------
- --------------------------------------------------------------------------------
 10)  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
      Instructions)   [    ]
- --------------------------------------------------------------------------------
 11)  Percent of Class Represented by Amount in Row (9)
      8.7%**
      ----
- --------------------------------------------------------------------------------
 12)  Type of Reporting Person (See Instructions)
       CO
      ----
- --------------------------------------------------------------------------------

*  Represents shares held by Cross Timbers Trading Company, a wholly owned 
   subsidiary of Cross Timbers Oil Company.

** Includes 525,000 shares (5.9%) held by Cross Timbers Trading Company.


                                  Page 2 of 7
<PAGE>
 
  SCHEDULE 13G

- --------------------------------------------------------------------------------
  CUSIP No. 977284 10 8
            -----------

- --------------------------------------------------------------------------------
  1)  Name of Reporting Persons
      I.R.S. Identification Nos. of above persons (entities only)

      Cross Timbers Trading Company
      -----------------------------
      75-2613610
      ----------
- --------------------------------------------------------------------------------
  2)  Check the Appropriate Box if a Member of a Group 
      (See Instructions)                                  a) [    ]  b) [    ]

- --------------------------------------------------------------------------------
  3)  SEC Use Only

- --------------------------------------------------------------------------------
  4)  Citizenship or Place of Organization
      Delaware
      --------
- --------------------------------------------------------------------------------

                            5)  Sole Voting Power
   Number of Shares
   Beneficially Owned by    ----------------------------------------------------
   Each Reporting Person    6)  Shared Voting Power
   With                         525,000
                                -------
                            ----------------------------------------------------
                            7)  Sole Dispositive Power
                                
                            ----------------------------------------------------
                            8)  Shared Dispositive Power
                                525,000
                                -------
- --------------------------------------------------------------------------------
  9)  Aggregate Amount Beneficially Owned by Each Reporting Person
      525,000
      -------
- --------------------------------------------------------------------------------
 10)  Check if the Aggregate Amount in Row (9) Excludes Certain Shares 
      (See   Instructions)   [     ]
- --------------------------------------------------------------------------------
 11)  Percent of Class Represented by Amount in Row (9)
      5.9%
      ----
- --------------------------------------------------------------------------------
 12)  Type of Reporting Person (See Instructions) 
       CO                                        
      ----                                       
- --------------------------------------------------------------------------------

                                  Page 3 of 7
<PAGE>
 
ITEM 1.
     (a) Name of Issuer:
           THE WISER OIL COMPANY
     (b) Address of Issuer's Principal Executive Offices:
           8115 Preston Road, Suite 400
           Dallas, Texas 75225

ITEM 2.
     (a) Name of Persons Filing:
           Cross Timbers Oil Company
           Cross Timbers Trading Company, a wholly owned
               subsidiary of Cross Timbers Oil Company
     (b) Address of Principal Business Office:
           810 Houston Street, Suite 2000
           Fort Worth, Texas 76102
     (c) Citizenship:
           Cross Timbers Oil Company is a Delaware corporation.
           Cross Timbers Trading Company is a Texas corporation.
     (d) Title of Class of Securities:
           Common Stock
     (e) CUSIP Number:
           977284 10 8


ITEM 3.
     This statement is filed pursuant to Rule 13d-1(c).
 
 
ITEM 4.    OWNERSHIP

     (a) Amount beneficially owned as of July 6, 1998:
               Cross Timbers Oil Company (includes shares
               held by Cross Timbers Trading Company)     775,000
               Cross Timbers Trading Company              525,000
     (b) Percent of class:
               Cross Timbers Oil Company (includes shares
               held by Cross Timbers Trading Company)         8.7%
               Cross Timbers Trading Company                  5.9%
     (c) Number of shares as to which such person has:
         (i)   Sole power to vote or to direct the vote:
               Cross Timbers Oil Company                  250,000
               Cross Timbers Trading Company                    0
         (ii)  Shared power to vote or to direct the vote:
               Cross Timbers Oil Company                  525,000
               Cross Timbers Trading Company              525,000
         (iii) Sole power to dispose or to direct the disposition of:
               Cross Timbers Oil Company                  250,000
               Cross Timbers Trading Company                    0
         (iv)  Shared power to dispose or to direct the disposition of:
               Cross Timbers Oil Company                  525,000
               Cross Timbers Trading Company              525,000
 

                                  Page 4 of 7
<PAGE>
 
ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

         Not applicable.


ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

         Not applicable.


ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

         Not applicable.


ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

         The persons identified under Item 2 above are filing this schedule as a
         group pursuant to Rule 13d-1(c).


ITEM 9.  NOTICE OF DISSOLUTION OF GROUP

         Not applicable.


ITEM 10. CERTIFICATION

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were not acquired and are not
         held for the purpose of or with the effect of changing or influencing
         the control of the issuer of the securities and were not acquired and
         are not held in connection with or as a participant in any transaction
         having that purpose or effect .

                                  Page 5 of 7
<PAGE>
 
SIGNATURES


    After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
 
                                  CROSS TIMBERS OIL COMPANY



Date:  July 6, 1998               By:  LOUIS G. BALDWIN
                                       ------------------------------------
                                       Louis G. Baldwin
                                       Senior Vice President and Chief 
                                         Financial Officer



                                  CROSS TIMBERS TRADING COMPANY



                                  By:  LOUIS G. BALDWIN
                                       ------------------------------------
                                       Louis G. Baldwin
                                       Senior Vice President and Chief Financial
                                         Officer

                                  Page 6 of 7

<PAGE>
 
                                                                    EXHIBIT 99.1


1. Joint Filing.  Pursuant to Rule 13d-1(k)(1)(iii) of Regulation 13D-G of the
   General Rules and Regulations of the Securities and Exchange Commission under
   the Securities Exchange Act of 1934, as amended, the undersigned agrees that
   the statement to which this Exhibit is attached is filed on behalf of each of
   them in the capacities set forth below.

2. Power of Attorney.  Know all persons by these presents that each person whose
   signature appears below constitutes and appoints Steffen E. Palko, J. Richard
   Seeds and Louis G. Baldwin, and each of them, as his or its true and lawful
   attorneys-in-fact and agents with full power of substitution and
   resubstitution, for such person and in such person's name, place and stead,
   in any and all capacities, to sign any and all amendments to the Schedule 13G
   and any reports filed pursuant to Section 16 of the Securities Exchange Act
   of 1934, filed on behalf of each of them with respect to their beneficial
   ownership of The Wiser Oil Company, and to file the same, with all exhibits
   thereto and all documents in connection therewith, with the Securities and
   Exchange Commission, granting unto said attorneys-in-fact and agents, and
   each of them, full power and authority to do and perform each and every act
   and thing requisite and necessary to be done in and about the premises, as
   fully to all intents and purposes as such person might or could do in person,
   hereby ratifying and confirming all that said attorneys-in-fact and agents or
   any of them, or such person or their substitute or substitutes, may lawfully
   do or cause to be done by virtue hereof.

   DATE:  July 6, 1998

                                       CROSS TIMBERS OIL COMPANY



                                       By:   LOUIS G. BALDWIN
                                             -----------------------------------
                                             Louis G. Baldwin
                                             Senior Vice President and Chief 
                                                Financial Officer



                                       CROSS TIMBERS TRADING COMPANY



                                       By:   LOUIS G. BALDWIN
                                             -----------------------------------
                                             Louis G. Baldwin
                                             Senior Vice President and Chief 
                                                Financial Officer

                                  Page 7 of 7


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