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**FORM        40–F/A**

**Amendment        No. 1**

**PETRO-CANADA**

| **Canada**                                                                                                         | **1311,                  1321, 1382, 5541**                                                                                                                  | **Not                  Applicable**                                                                     |
|--------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------|
| (Province                  or otherjurisdiction                  ofincorporation                  or organization) | (Primary                  standard industrialclassification                  code number,if                  applicable)                                     | (I.R.S.                  employeridentification                  number,if                  applicable) |
|                                                                                                               |                                                                                                                                                         |                                                                                                    |
|                                                                                                               | 150                  – 6th                  Avenue S.W.Calgary,                  AlbertaCanada                  T2P 3E3(403)                  296-8000 |                                                                                                    |
| (Address                  and telephone number of registrant’s principal executive                  office)  |

**CT        Corporation System**

**111        Eight Avenue - CT**

**New        York, New York 10011**

**(212)        894-8940**

**Common        Shares                                                              New        York Stock Exchange**

**None**

**5%        Senior Notes due        2014**

**9¼%        Debentures Due        2021**

**77/8%        Debentures Due        2026**

**7%        Debentures Due        2028**

**4%        Senior Notes Due        2013**

**5.35%        Senior Notes Due        2033**

**5.95%        Senior Notes Due        2035**

**INTRODUCTORY        NOTE**

**SUPPLEMENTARY        INFORMATION ON RESERVE REPLACEMENT RATIOS**

|                     | 2006                                                                           | SEC                                                               |
|--------------------------|--------------------------------------------------------------------------------|-------------------------------------------------------------------|
| RRR                      | 40-F                  filing (includes oil sands mining and is before royalty) | (excludes                  oil sands mining and is after royalty) |
| 2006                     | 134%                                                                           | 173%                                                              |
| 2005                     | 111%                                                                           | 121%                                                              |
| 5yr                  Avg | 160%                                                                           | 172%                                                              |

**SUPPLEMENTARY        INFORMATION ON NON-GAAP MEASURES**

**EXHIBITS**

**Exhibits                                                          Description**

|   | _________ |
|--------|-----------|

**UNDERTAKING        AND CONSENT TO SERVICE OF PROCESS**

**A.                         Undertaking**

|   | The                  Registrant undertakes to make available, in person or by telephone,                  representatives to respond to inquiries made by the staff of the                  Securities and Exchange Commission (“SEC”), and to furnish promptly, when                  requested to do so by the SEC staff, information relating to the                  securities in relation to which the obligation to file an annual                  report on                  Form 40-F arises or transactions in said                  securities. |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| **B.** | **Consent                  to Service of Process** |
|--------|----------------------------------------------------|

|   | The                  Registrant has previously filed a Form F-X with the SEC on March                  10,                  1994. |
|--------|-----------------------------------------------------------------------------------------------------------------------------------|

|   | **SIGNATURE** |
|--------|---------------|

**EXHIBITS**

**Exhibits                                                                                 Description**

| 99.8   | Certification                  of CEO pursuant to Section 302 of the Sarbanes-Oxley Act, dated                  October 1,                  2007 |
|------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|

| 99.9   | Certification                  of CFO pursuant to Section 302 of the Sarbanes-Oxley Act, dated                  October 1,                  2007 |
|------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|

| 99.10   | Certification                  of CEO pursuant to 18 U.S.C. Section 1350, as adopted pursuant                  to Section                  906 of the Sarbanes-Oxley Act of 2002, dated October 1,                  2007 |
|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 99.11   | Certification                  of CFO pursuant to 18 U.S.C. Section 1350, as adopted pursuant                  to Section                  906 of the Sarbanes-Oxley Act of 2002, dated October 1,                  2007 |
|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|