PORSCHE RACING HISTORYMarc Duez (B)
1985
1 September 1985 - Spa 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 8 | Porsche 956 | 956-104 | C1 | "John Winter" Louis Krages (D)/Marc Duez (B)/Volker Weidler (D) | New Man Joest Racing (D) | 6th | 6th | 9th | 120 laps |
6 October 1985 - Fuji 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 956 B | 956-117 | C1 | Paolo Barilla (I)/Marc Duez (B)/"John Winter" Louis Krages (D) | Newman Joest Racing (D) | DNF | 5th | 9 laps - Withdrawn due to weather |