| 1987 · 1000 km Jerez | did_not_qualify | - | C2 | John Bartlett Racing | Kenneth Leim · Max Cohen-Olivar · Val Musetti | Bardon DB1 Ford | — | | WSPR historical record |
| 1987 · Autoglass 1000 Kilometres Silverstone | retired | 103 | C2 | John Bartlett Racing with G | John Bartlett · Val Musetti · Kenneth Leim | Bardon DB1/2 Ford | — | 123 | WSPR historical record |
| 1987 · Shell Gemini 1000 Kilometres Brands Hatch | retired | 200 | C2 | Dahm Cars Racing Team | Kenneth Leim · Robin Donovan | Argo JM19 Porsche Turbo | — | 54 | WSPR historical record |
| 1987 · Int. ADAC-1000-km-Rennen, Nürburgring | retired | 200 | C2 | Dahm Cars Racing Team | Fritsch · Kenneth Leim · Dieter Heinzelmann | Argo JM19 Porsche Turbo | — | 11 | WSPR historical record |
| 1987 · Kouros 1000 km Spa | retired | 200 | C2 | Manfred Dahm Racing Team | Patrick de Radigues · Kenneth Leim · DNS - G. Neve | Argo JM19 Porsche | — | 4 | WSPR historical record |
| 1986 · Kouros' 1000 km Silverstone | retired | 72 | C2 | Bardon Racing | Nick Adams · Max Cohen-Olivar · Kenneth Leim | Bardon DB01 Ford | — | 106 | WSPR historical record |
| 1986 · Shell Gemini 1000 km Brands Hatch | 18 | 72 | 0. C2 | John Bartlett Racing with G | Robin Donovan · Kenneth Leim · Max Cohen-Olivar | Bardon DB1 Ford | — | 165 | WSPR historical record |
| 1986 · ADAC Kouros 1000 km Nürburgring | retired | 72 | C2 | John Bartlett Racing with G | Kenneth Leim · David Mercer | Bardon DB1 Ford | — | 60 | WSPR historical record |
| 1986 · Kouros 1000 Kilometres Spa | 19 | 72 | 5. C2 | John Bartlett Racing with G | David Mercer · Kenneth Leim · Ian Khan | Bardon DB1 Ford | — | 112 | WSPR historical record |
| 1986 · Mount Fuji 1000 Kilometres, Fuji Speedway | retired | 72 | C2 | John Bartlett Racing with G | Robin Donovan · Kenneth Leim · Yoshiyuki Ogura | Bardon DB1 Ford | — | 32 | WSPR historical record |
| 1985 · Malaysia 800 Selangor, Shah Alam | 11 | 100 | 5. C2 | Bartlett Chevron Racing | Kenneth Leim · Robin Smith · Robin Donovan | Chevron B62 Ford | — | 146 | WSPR historical record |
| 1985 · 1000 km Spa | retired | 100 | C2 | John Bartlett | Richard Jones · Max Cohen-Olivar · Kenneth Leim | Chevron B62 Ford | — | 33 | WSPR historical record |
| 1985 · Fuji 1000 Kilometres | retired | 100 | C2 | Bartlett Chevron Racing wit | Robin Smith · Martin Birrane · Kenneth Leim | Chevron B62 Ford | — | 11 | WSPR historical record |
| 1984 · Trofeo Filippo Caracciolo, Monza | 13 | 117 | 2. B | Strandell Racing | Kenneth Leim · Thomas Wiren | Porsche 930 | — | 134 | WSPR historical record |
| 1984 · Sandown Park 1000 Kilometres | retired | 113 | B | Strandell Racing | Nick Faure · Kenneth Leim · Clark | Porsche 930 | — | | WSPR historical record |
| 1984 · Grand Prix International 1000 Kilometres, Silverstone | retired | 117 | B | Strandell Racing | Kenneth Leim · Thomas Wiren | Porsche 930 | — | 114 | WSPR historical record |
| 1984 · ADAC 1000 Kilometres, Nürburgring | source_section_other_starters | 113 | B | Strandell Motors | Kenneth Leim · Götz von Tschirnhaus | Porsche 930 | — | | WSPR historical record |
| 1983 · Castrol 1000 km Kyalami | 9 | 74 | 2. B | Strandell Racing | Thomas Wiren · Kenneth Leim | Porsche 930 | — | 193 | WSPR historical record |
| 1982 · Trofeo Filippo Caracciolo, Monza | did_not_qualify | 92 | Gr.5 | Kenneth Leim | Kurt Simonsen · Kenneth Leim | BMW 320i | — | | WSPR historical record |
| 1982 · The Pace Petroleum 6 Hours, Silverstone | retired | 75 | Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | BMW 320i | — | 37 | WSPR historical record |
| 1982 · Rudolf Caracciola Wanderpreis 1000 Kilometres, Nürburgring | entry_only | 49 | Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | BMW 320i | — | | WSPR historical record |
| 1982 · Trophee Diners Club 1000 kilometres, Spa-Francorchamps | did_not_start | 69 | Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | BMW 320i | — | | WSPR historical record |
| 1982 · Trofeo Banca Toscana 1000 kilometres, Mugello | entry_only | 19 | Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | BMW 320i | — | | WSPR historical record |
| 1979 · 6 Hours of Mugello | retired | 57 | Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche 934 | — | | WSPR historical record |
| 1979 · Dijon 6 Hours | 14 | 50 | 4. GT | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche 934 | — | 213 | WSPR historical record |
| 1979 · Rivet Supply 6 Hours, Silverstone | 8 | 14 | 4. GT | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche 934 | — | 197 | WSPR historical record |
| 1979 · 25th 1000 km Nürburgring | entry_only | 43 | GT | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche 934 | — | | WSPR historical record |
| 1979 · 19. Coppa Florio, Pergusa | entry_only | - | GT | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche 934 | — | | WSPR historical record |
| 1979 · Rivet Suply 6 hours, Brands Hatch | 16 | 10 | 8. GT | Kenneth Leim | Kenneth Leim · Lella Lombardi | Porsche 934 | — | 198 | WSPR historical record |
| 1979 · Trofeo Ignazio Giunti, Vallelunga | entry_only | 58 | GT | Kenneth Leim | Kenneth Leim · Jean-Pierre Delaunay | Porsche 934 | — | | WSPR historical record |
| 1978 · 6 h Mugello | entry_only | 28 | GT | Lombardi/Leim | Kenneth Leim · Lella Lombardi | Porsche 934 | — | | WSPR historical record |
| 1978 · 6 h Dijon | 9 | 36 | 2. GT | Kenneth Leim | Kurt Simonsen · Kenneth Leim | Porsche 934 | — | 147 | WSPR historical record |
| 1978 · 6 h Silverstone | 15 | 22 | 5. GT | Kenneth Leim | Kenneth Leim · Lella Lombardi | Porsche 934 | — | 178 | WSPR historical record |
| 1978 · 1000 km Nürburgring | retired | 40 | GT | Kenneth Leim | Kenneth Leim · Otto Köhler · Lella Lombardi | Porsche 934 | — | 11 | WSPR historical record |
| 1978 · Misano 6 Hours | retired | 24 | GT | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche 934 | — | 121 | WSPR historical record |
| 1978 · 6 h Vallelunga | entry_only | 11 | Gr.5 | Lombradi/Leim | Kenneth Leim · Lella Lombardi | Porsche 934 | — | | WSPR historical record |
| 1977 · 500 km Paul Ricard, Le Castellet | 13 | 40 | 1. GT | Kurt Simonsen | Kurt Simonsen · Kenneth Leim | Porsche Carrera RSR | — | 133 | WSPR historical record |
| 1977 · Kosset 6 Hours, Silverstone | 9 | 31 | 7. Gr.5 | Kenneth Leim | Kurt Simonsen · Kenneth Leim | Porsche Carrera RSR | — | 206 | WSPR historical record |
| 1977 · ADAC 1000 km Nürburgring | 9 | 18 | 8. Gr.5 | Kenneth Leim | Kurt Simonsen · Kenneth Leim | Porsche Carrera RSR | — | 40 | WSPR historical record |
| 1977 · Rivet Supply 6 Hours, Brands Hatch | retired | 21 | Gr.5 | Kenneth Leim | Lella Lombardi · Kenneth Leim | Porsche Carrera RSR | — | 16 | WSPR historical record |
| 1977 · Hessen Preis, Hockenheim | 14 | 21 | 9. Gr.5 | Kenneth Leim | Kenneth Leim · Lella Lombardi | Porsche Carrera RSR | — | 144 | WSPR historical record |
| 1977 · 6 Ore di Vallelunga | 4 | 19 | 1. GT | Kenneth Leim | Lella Lombardi · Kenneth Leim | Porsche Carrera RSR | — | 240 | WSPR historical record |
| 1976 · March Trophy, Mugello 6 Hours | 5 | 22 | 4. Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche Carrera RSR | — | 157 | WSPR historical record |
| 1976 · Trofeo Ignazio Giunti, Vallelunga 6 Hours | 3 | 23 | 3. Gr.5 | Kenneth Leim | Kenneth Leim · Kurt Simonsen | Porsche Carrera RSR | — | 245 | WSPR historical record |
| 1976 · World Championship of Maker, 6 Hours of Silverstone | 7 | 31 | 2. GT | Kenneth Leim | Kurt Simonsen · Kenneth Leim | Porsche Carrera RSR | — | 189 | WSPR historical record |
| 1976 · ADAC 1000 Kilometres, Nürburgring | retired | 34 | Gr.5 | Kenneth Leim | Kurt Simonsen · Roland Larsson · Kenneth Leim | Porsche Carrera RSR | — | 13 | WSPR historical record |
| 1976 · Martha 1000, Zeltweg 6 Hours, Österreichring | retired | 26 | Gr.5 | Kenneth Leim | Kurt Simonsen · Kenneth Leim | Porsche Carrera RSR | — | 109 | WSPR historical record |
| 1976 · ACF 6 Hours Dijon | 12 | 65 | 0. Gr.5 | Kenneth Leim | Kurt Simonsen · Kenneth Leim | Porsche Carrera RSR | — | 276 | WSPR historical record |