PORSCHE RACING HISTORYDieter Quester (A)
1985 : Sebring 12 Hours - 3rd overall
3 February 1985 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 68 | Porsche 962 | 962-108 | GTP | Pete Halsmer (USA)/Dieter Quester (A)/John Morton (USA) | B.F. Goodrich (USA) | 59th | 23rd | 15th | 107 laps - Accident |
23 March 1985 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 68 | Porsche 962 | 962-105 | GTP | Pete Halsmer (USA)/Dieter Quester (A)/Rick Knoop (USA) | Busby Racing (USA) | 3rd | 3rd | 12th | 268 laps |