| 23.3.1975 | 1000 km Mugello | 51 | Porsche 911 Carrera | Bertrams / Schickentanz / Wisell | Tebernum Porsche Racing | 12th |
| 23.3.1975 | 1000 km Mugello | 52 | Porsche 911 Carrera | Schickentanz / Bertrams / Wisell | Tebernum Porsche Racing | 10th |
| 30.3.1975 | Nürburgring [GT/T] | | Porsche 911 Carrera | Hartwig Bertrams | Tebernum-Porsche-Racing-Team | 6th |
| 31.3.1975 | Nürburgring Goodyear Pokal | | Porsche 911 Carrera | Hartwig Bertrams | Tebernum-Porsche-Racing-Team | 13th |
| 6.4.1975 | 800 km Dijon | 8 | Porsche 911 Carrera | Schickentanz / Bertrams / Wisell | Tebernum Porsche Racing | 7th |
| 13.4.1975 | Euro GT Imola | | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche | DQ |
| 20.4.1975 | 1000 km Monza | 79 | Porsche 911 Carrera | Wisell / Schickentanz / Bertrams | Tebernum Porsche Racing Team | DNF |
| 20.4.1975 | 1000 km Monza | 81 | Porsche 911 Carrera | Schickentanz / Bertrams / Wisell | Tebernum Porsche Racing Team | 9th |
| 27.4.1975 | DRM Nürburgring Eifelrennen | 7 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum-Porsche Racing-Team | 7th |
| 4.5.1975 | 1000 km Spa | 40 | Porsche 911 Carrera | Bertrams / Wisell | Tebernum Racing | 8th |
| 4.5.1975 | 1000 km Spa | 41 | Porsche 911 Carrera | Schickentanz / Bertrams / Wisell | Tebernum Racing | 6th |
| 18.5.1975 | Coppa Florio | 47 | Porsche 911 Carrera | Schickentanz / Bertrams / Wisell | Tebernum Porsche Racing Team | 5th |
| 18.5.1975 | Coppa Florio | 48 | Porsche 911 Carrera | Bertrams / Wisell / Schickentanz | Tebernum Porsche Racing Team | 4th |
| 25.5.1975 | Euro GT Zeltweg | 6 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche Racing Team | 4th |
| 25.5.1975 | Euro GT Zeltweg | 7 | Porsche 911 Carrera | In entry list only | Team Bla Racing | raced |
| 1.6.1975 | 1000 km Nürburgring | 58 | Porsche 911 Carrera | Schickentanz / Bertrams / Wisell | Tebernum-Porsche-Racing-Team | 14th |
| 1.6.1975 | 1000 km Nürburgring | 59 | Porsche 911 Carrera | Bertrams / Schickentanz / Wisell | Tebernum-Porsche-Racing-Team | DNF |
| 8.6.1975 | DRM Hockenheim Rhein-Pokal | 52 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche Racing Team | 5th |
| 15.6.1975 | 24 h Le Mans | 16 | Porsche 911 Carrera | Schickentanz / Bertrams | Joest Racing | DNF |
| 15.6.1975 | DRM Mainz-Finthen | 59 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche Racing Team | DNF |
| 29.6.1975 | Euro GT Norisring | 7 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche | DNF |
| 29.6.1975 | DRM Norisring | 7 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche Racing Team | DNS |
| 13.7.1975 | GP Nürburgring | 3 | BMW 3.0 CSL | Betzler / Bertrams / Müller | BMW-Faltz-Alpina-Tuning | 3rd |
| 20.7.1975 | Euro GT Hockenheim | 607 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum-Porsche-Racing-Team | 4th |
| 3.8.1975 | Euro GT Misano | | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche | 3rd |
| 10.8.1975 | ETCC Zandvoort | 3 | Porsche 911 Carrera | Schickentanz / Bertrams | Tebernum Racing Team | 3rd |
| 17.8.1975 | DRM Kassel-Calden | 65 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche Racing Team | 6th |
| 24.8.1975 | NTK Zandvoort | 7 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche Racing | 1st |
| 24.8.1975 | Interserie Zandvoort | 51 | Alfa Romeo T33/TT/12 | Hartwig Bertrams | Willi Kauhsen Racing Team | 11th |
| 31.8.1975 | Knutstorp [T/GT] | 19 | Porsche 911 Carrera | Hartwig Bertrams | | DNA |
| 7.9.1975 | Supersprint Nürburgring | 8 | Porsche 911 Carrera | Hartwig Bertrams | Tebernum-Porsche-Racing-Team Krefeld | DNA |
| 28.9.1975 | 6 h Monza | 33 | Porsche 911 Carrera | Bertrams / Schickentanz / Ekberg | Tebernum Porsche Racing Team | 1st |
| 2.11.1975 | 200 km Jarama | | Porsche 911 Carrera | Hartwig Bertrams | Tebernum Porsche | DNA |