PORSCHE RACING HISTORYMichael Andretti (USA)
1983 : Le Mans 24 Hours - 3rd overall
19 March 1983 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 09 | Porsche 935 L | 935 L | GTP | Derek Bell (GB)/Michael Andretti (USA)/John Paul, Jr. (USA) | Henn's Swap Shop Racing (USA) | 56th | 9th | 1st | 125 laps - Engine |
24 April 1983 - Riverside 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 935 K3 | 000 0009 | GTP | Michael Andretti (USA)/A. J. Foyt (USA)/Mario Andretti (USA)/Preston Henn (USA) | PPG Industries (USA) | 20th | 7th | 9th | 154 laps - DNF |
19 June 1983 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 21 | Porsche 956 | 956-101 | C | Mario Andretti (USA)/Michael Andretti (USA)/Philippe Alliot (F) | Porsche Kremer Racing (D) | 3rd | 3rd | 8th | 364 laps |