PORSCHE RACING HISTORYCees Sievertsen (NL)
1975 : DARM Hockenheim [GT+2.0/T+2.0] - 3rd in class : Diepholz [GT] - 1st overall : Rheintal Hockenheim [GT] - 1st overall
13 April 1975 - DARM Hockenheim [GT+2.0/T+2.0] - DARM - Deutscher Automobil-Rundstrecken-Pokal
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | 005-0004 | GT+2.0 | Cees Sievertsen (NL) | Kremer-Team | 4th | 3rd |
8 June 1975 - DRM Hockenheim Rhein-Pokal - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 49 | Porsche 911 Carrera RSR | 005-0004 | Div.I | Cees Sievertsen (NL) | Jägermeister Kremer Team (D) | 6th | 6th | 109th | 20 laps |
29 June 1975 - European GT Championship Norisring - European Championship for Grand Touring Cars
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 911 Carrera RSR | 005-0004 | GT3.0 | Cees Sievertsen (NL) | Erwin Kremer (D) | 6th | 64 laps |
20 July 1975 - Diepholz [GT] - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | 005-0004 | GT+2.0 | Cees Sievertsen (NL) | Lucky Star/Wally's Jeans Kremer Team (D) | 1st | 1st | 20 laps |
20 July 1975 - DRM Diepholz - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | 005-0004 | Div.1 | Cees Sievertsen (NL) | Lucky Star Wally's Jeans Kremer Team (D) | 8th | 8th | 3rd | 38 laps |
17 August 1975 - DRM Kassel-Calden - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 58 | Porsche 911 Carrera RSR | 005-0004 | Div.1 | Cees Sievertsen (NL) | Lucky Star Wallys Jeans Kremer Team (D) | DNF | 12th | 19 laps |
31 August 1975 - DRM Hockenheim Preis der Nationen - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 911 Carrera RSR | 005-0004 | Div.1 | Cees Sievertsen (NL) | Lucky Star Wallys Jeans Kremer-Team (D) | 8th | 8th | 9th | 20 laps |
7 September 1975 - Supersprint Nürburgring - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 6 | Porsche 911 Carrera RSR | 005-0004 | GT | Cees Sievertsen (NL) | Lucky Star Wallys Jeans Kremer Team (D) | 4th | 4th |
28 September 1975 - DRM Hockenheim Preis von Baden-Württemberg - DRM - Deutsche Rennsport Meisterschaft
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | 005-0004 | Div.1 | Cees Sievertsen (NL) | Erwin Kremer (D) | DNF | 9th | 24 laps |
29 November 1975 - Rheintal Hockenheim [GT] - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| Porsche 911 Carrera RSR | 005-0004 | GT+2.0 | Cees Sievertsen (NL) | Lucky Star Wally's Jeans Kremer Team (D) | 1st | 1st | 8 laps |