1 SCHEDULE 13D (Rule 13d-101) SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Under the Securities Exchange Act of 1934 Amendment No. 10 ------ National-Oilwell, Inc. - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 637071 10 1 - -------------------------------------------------------------------------------- (CUSIP Number) Thomas R. Denison - First Reserve Corporation 1801 California St., #4110, Denver, CO 80202, (303) 382-1270 - -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) January 26, 2001 - -------------------------------------------------------------------------------- (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 Rule 13d-1(e), 13d-1(f) or 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 Rule 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 purpose 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).

2 CUSIP NO. 637071 10 1 SCHEDULE 13D Page 2 of 10 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON First Reserve Corporation I.R.S. No.: 06-1210123 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* N/A - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO [ ] ITEMS 2(d) OR 2(e) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 0 BENEFICIALLY ----------------------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 4,757,434 PERSON ----------------------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 0 ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,757,434 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.9% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

3 CUSIP NO. 637071 10 1 SCHEDULE 13D Page 3 of 10 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON First Reserve Fund VI, Limited Partnership I.R.S. No.: 06-1334650 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* N/A - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO [ ] ITEMS 2(d) OR 2(e) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 0 BENEFICIALLY ----------------------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 1,649,734 PERSON ----------------------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 0 ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 1,649,734 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,649,734 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.1% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

4 CUSIP NO. 637071 10 1 SCHEDULE 13D Page 4 of 10 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON First Reserve Fund VII, Limited Partnership I.R.S. No.: 06-1457408 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* N/A - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO [ ] ITEMS 2(d) OR 2(e) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 0 BENEFICIALLY ----------------------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 1,278,600 PERSON ----------------------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 0 ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 1,278,600 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,278,600 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.6% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

5 CUSIP NO. 637071 10 1 SCHEDULE 13D Page 5 of 10 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON First Reserve Fund VIII, L.P. I.R.S. No.: 06-1507364 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* N/A - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO [ ] ITEMS 2(d) OR 2(e) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 0 BENEFICIALLY ----------------------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 1,829,100 PERSON ----------------------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 0 ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 1,829,100 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,829,100 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.3% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

6 CUSIP NO. 637071 10 1 SCHEDULE 13D Page 6 of 10 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON First Reserve GP VII, L.P. I.R.S. No.: 06-1520256 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* N/A - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO [ ] ITEMS 2(d) OR 2(e) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 0 BENEFICIALLY ----------------------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 1,278,600 PERSON ----------------------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 0 ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 1,278,600 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,278,600 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.6% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

7 CUSIP NO. 637071 10 1 SCHEDULE 13D Page 7 of 10 Pages - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON First Reserve GP VIII, L.P. I.R.S. No.: 06-1507318 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* N/A - -------------------------------------------------------------------------------- 5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO [ ] ITEMS 2(d) OR 2(e) - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 0 BENEFICIALLY ----------------------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 1,829,100 PERSON ----------------------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 0 ----------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 1,829,100 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,829,100 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.3% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* PN - -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

8 This Amendment No. 10 to the statement on Schedule 13D (the "Statement"), originally filed on September 28, 1998, is filed by First Reserve Fund VI, Limited Partnership ("Fund VI"), First Reserve Fund VII, Limited Partnership ("Fund VII"), First Reserve GP VII, L.P. ("GP VII"), First Reserve Fund VIII, L.P. ("Fund VIII"), and First Reserve GP VIII, L.P. ("GP VIII," and collectively, the "Funds"), and First Reserve Corporation ("First Reserve," and together with the Funds, the "Reporting Persons") and relates to the Common Stock, par value $0.01 per share (the "Common Stock"), of National-Oilwell, Inc., a Delaware corporation (the "Issuer" or "National-Oilwell"). Schedule 13D is hereby amended as set forth below to correct a clerical error in Amendment No. 9 (specifically, the total amount of Common Stock owned by the Reporting Persons as of January 26, 2001.). ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. Item 5(a) is hereby deleted and replaced with the following: (a) As of January 26, 2001, the Reporting Persons beneficially owned an aggregate of 4,769,932 shares of Common Stock which constitute approximately 5.9% of the 80,285,395 shares of Common Stock outstanding as of November 10, 2000, as reported by the Company. NUMBER OF SHARES PERCENTAGE OF REPORTING PARTY BENEFICIALLY OWNED CLASS First Reserve Corporation (1), (2) 4,769,932 5.9% Fund VI 1,649,734 2.1% Fund VII 1,278,600 1.6% Fund VIII 1,829,100 2.3% GP VII (2) 1,278,600 1.6% GP VIII (2) 1,829,100 2.3% (1) Consists of 4,757,434 shares of Common Stock held directly by First Reserve and the Funds, and 9,950 shares underlying stock options issued to William E. Macaulay and 2,548 shares underlying stock options issued to Ben A. Guill in their capacity as directors of the Issuer. First Reserve may be deemed to share dispositive and voting control over these shares. (2) GP VII and GP VIII are the general partners of Fund VII and Fund VIII, respectively, and may be deemed to beneficially own the shares of Common Stock owned by Fund VII and Fund VIII. First Reserve, as the general partner of GP VII and GP VIII, may be deemed to beneficially own all of the shares of Common Stock owned by the Funds. Page 8 of 10

9 SIGNATURE 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. Dated: February 5, 2001 FIRST RESERVE CORPORATION By: /s/ Thomas R. Denison ---------------------------------- Name: Thomas R. Denison Title: Managing Director FIRST RESERVE FUND VI, LIMITED PARTNERSHIP By: First Reserve Corporation, as General Partner By: /s/ Thomas R. Denison ------------------------------ Name: Thomas R. Denison Title: Managing Director FIRST RESERVE FUND VII, LIMITED PARTNERSHIP By: First Reserve GP VII, L.P., as General Partner By: First Reserve Corporation, as General Partner By: /s/ Thomas R. Denison ------------------------------ Name: Thomas R. Denison Title: Managing Director Page 9 of 10

10 FIRST RESERVE FUND VIII, L.P. By: First Reserve GP VIII, L.P., as General Partner By: First Reserve Corporation, as General Partner By: /s/ Thomas R. Denison ------------------------------ Title: Managing Director FIRST RESERVE GP VII, L.P. By: First Reserve Corporation, as General Partner By: /s/ Thomas R. Denison ------------------------------ Name: Thomas R. Denison Title: Managing Director FIRST RESERVE GP VIII, L.P. By: First Reserve Corporation, as General Partner By: /s/ Thomas R. Denison ------------------------------ Name: Thomas R. Denison Title: Managing Director Page 10 of 10