PORSCHE RACING HISTORYAxel Plankenhorn (D)
1983
10 April 1983 - Monza 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 956 | 956-109 | C | Axel Plankenhorn (D)/Jürgen Lässig (D)/Jürgen Barth (D) | Obermaier Racing | 4th | 4th | 9th | 163 laps |
8 May 1983 - Silverstone 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 956 | 956-109 | C | Axel Plankenhorn (D)/Jürgen Lässig (D)/Harald Grohs (D) | Obermaier Racing (D) | 4th | 4th | 8th | 201 laps |
29 May 1983 - Nürburgring 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 956 | 956-109 | C | Jürgen Lässig (D)/Axel Plankenhorn (D)/Hans Heyer (D) | Obermaier Racing (D) | 4th | 4th | 8th | 42 laps |
19 June 1983 - Le Mans 24 Hours - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 956 | 956-109 | C | Axel Plankenhorn (D)/Jürgen Lässig (D)/Desiré Wilson (ZA) | Obermaier Racing (D) | 7th | 7th | 12th | 347 laps |
4 September 1983 - Spa 1000 km - World Endurance Championship
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 18 | Porsche 956 | 956-109 | C | Jürgen Lässig (D)/Axel Plankenhorn (D)/Hervé Regout (B) | Obermaier Racing (D) | 5th | 5th | 13th | 136 laps |