IMPCO TECHNOLOGIES INC
SC 13D/A, 1998-12-24
MOTOR VEHICLE PARTS & ACCESSORIES
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934
                               (Amendment No. 5)*

                            IMPCO Technologies, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                    45255W106
                -----------------------------------------------
                                 (CUSIP Number)

                               John M. Allen, Jr.
                              Debevoise & Plimpton
                                875 Third Avenue
                               New York, NY 10022
                                 (212) 909-6000
- --------------------------------------------------------------------------------
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                December 10, 1998
          ------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Sections 240.13d-1(3), 240.13d-1(f) or 240.13d-1(g), check
the following box [ ].

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7(b) for
other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purposes of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


                       (Continued on the following pages)
<PAGE>   2
CUSIP No. 45255W106                    13D                    Page 2 of 4 Pages



- --------------------------------------------------------------------------------
1     NAME OF REPORTING PERSON                           BERU Aktiengesellschaft
      S.S. OR I.R.S. IDENTIFICATION NO.
      OF ABOVE PERSON                                    Not applicable

- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                  (a) [ ]
                                                                        (b) [ ]

- --------------------------------------------------------------------------------
3     SEC USE ONLY

- --------------------------------------------------------------------------------
4     SOURCE OF FUNDS
                                                                          WC

- --------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)                                                 [ ]

- --------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION
                                                                       Germany
- --------------------------------------------------------------------------------
                  7     SOLE VOTING POWER
 NUMBER OF
   SHARES                                                               937,164
BENEFICIALLY      --------------------------------------------------------------
  OWNED BY        8     SHARED VOTING POWER
    EACH                                                                      0
  REPORTING       --------------------------------------------------------------
   PERSON         9     SOLE DISPOSITIVE POWER
    WITH
                                                                         937,164
                  --------------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER
                                                                              0
- --------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                        937,164
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
      SHARES                                                                [ ]
- ------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                                                                          13.0%
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON
                                                                             CO

- --------------------------------------------------------------------------------
<PAGE>   3
CUSIP No. 45255W106                  13D                      Page 3 of 4 Pages


                    CONTINUATION PAGES OF AMENDMENT NO. 5 TO
                       STATEMENT ON SCHEDULE 13D FILED BY
                             BERU Aktiengesellschaft


            This Amendment No. 5 to the Schedule 13D, dated May 20, 1998, as
amended by Amendment No. 1 thereto, dated July 16, 1998, Amendment No. 2
thereto, dated September 3, 1998, Amendment No. 3 thereto, dated October 5, 1998
and Amendment No. 4 thereto, dated December 15, 1998 (as so amended, the
"Schedule 13D"), previously filed by BERU Aktiengesellschaft ("BERU"), relates
to BERU's beneficial ownership of the common stock of IMPCO Technologies, Inc.,
a Delaware corporation (the "Issuer"). Items 3 and 5 are hereby supplemented and
amended to include purchases of the Issuer's common stock inadvertently omitted
in previously filed Amendment.

Item 3. Source and Amount of Funds or Other Consideration.

            BERU acquired 24,000 shares of Common Stock of the Issuer reported
in Item 5(c) below for total cash consideration of $307,000, plus commissions.
Funds to acquire all shares were provided by BERU's working capital.

Item 5.     Interest in Securities of the Company.

            (a) Reference is made to rows (11) and (13) of the cover page. The
calculation of BERU's ownership percentage is based on 7,188,686 shares of
Common Stock outstanding as of August 31, 1998, as reported by Issuer in its
Form 10-Q filed on September 14, 1998.

            (b) Reference is made to rows (7) through (10) of the cover page.

            (c) BERU acquired shares of Common Stock of the Issuer in the
following open market transactions:

<TABLE>
<CAPTION>
Date of Purchase               Number of Shares               Price per Share
- ----------------               ----------------               ---------------
<S>                            <C>                           <C>
10/5/98                             2,000                         $12.50
10/6/98                             4,000                         $12.50
10/8/98                            11,000                         $12.50
12/9/98                             7,000                         $13.50
</TABLE>

Also, see Item 3 above.
<PAGE>   4
CUSIP No. 45255W106                   13D                     Page 4 of 4 Pages



                                    SIGNATURE

            After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement with respect to the
undersigned is true, complete and correct.

Dated:   December 23, 1998

                                 BERU Aktiengesellschaft



                              By: /s/ Ulrich Ruetz
                                  -----------------------------------------
                                  Name:  Ulrich Ruetz
                                  Title: Chairman and
                                         Chief Executive Officer



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