| 11.1.1998 | Daytona Test | 01 | #008 | McNish / Sullivan / Müller / Müller / Peter / Sospiri / Murry / Basseng | Rohr Motorsport | 12th |
| 1.2.1998 | 24 h Daytona | 00 | #104 | Bouchut / Goueslard / Rosenblad / Ahrlé | Larbre Competition | 3rd |
| 1.2.1998 | 24 h Daytona | 01 | #006 | McNish / Sullivan / Müller / Müller / Alzen | Rohr Motorsport | 2nd |
| 1.2.1998 | 24 h Daytona | 38 | #005 | Boutsen / Pilgrim / Kelleners | Champion Motors | 19th |
| 22.3.1998 | 12 h Sebring | 01A | #008 | | Rohr | DNE |
| 22.3.1998 | 12 h Sebring | 74 | #005 | Boutsen / Wollek / Pilgrim | Champion Motors | 3rd |
| 23.3.1998 | Test Silverstone | | | Morelli / Goode | Millenium | 6th |
| 23.3.1998 | Test Silverstone | | #101 | Greasley / Wallinder | Blue Coral | 3rd |
| 5.4.1998 | British GT Silverstone | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | 1st |
| 5.4.1998 | British GT Silverstone | 11 | | Nielsen / Thyrring | Millennium Motorsport | 5th |
| 3.5.1998 | Prequalifying Le Mans | 47 | | Morelli / Goode | Millenium Motorsport | DNA |
| 3.5.1998 | Prequalifying Le Mans | 48 | #04/00? | Jarier | Larbre Competition | 27th |
| 4.5.1998 | British GT Oulton Park | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | 2nd |
| 4.5.1998 | British GT Oulton Park | 11 | | Thyrring / Nielsen | Millennium Motorsport | 4th |
| 10.5.1998 | CDN GT Mosport BARC Spring | 00 | #102 | Klaus Bytzek | BMS Race Team | 1st |
| 17.5.1998 | 2 h 15 min Homestead | 38 | #005 | Boutsen / Raphanel | Champion Motors | 4th |
| 24.5.1998 | British GT Croft | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | 4th |
| 24.5.1998 | CDN GT Mosport BEMC Spring | 00 | #102 | Klaus Bytzek | BMS Race Team | 1st |
| 24.5.1998 | British GT Croft | 11 | | Thyrring / Nielsen | Millennium Motorsport | 1st |
| 7.6.1998 | 24 h Le Mans | 47 | | Rosenblad / Morelli / Goode | Millenium Motorsport | DNA |
| 7.6.1998 | 24 h Le Mans | 48 | #04/00? | Jarier / Goueslard / Donovan | Larbre Competition | DNPQ |
| 14.6.1998 | British GT Snetterton | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | DNF |
| 14.6.1998 | CDN GT Shannonville CRDA Shootout | 00 | #102 | Klaus Bytzek | BMS Race Team | 1st |
| 14.6.1998 | British GT Snetterton | 11 | | Thyrring / Nielsen | Millennium Motorsport | DNA |
| 14.6.1998 | 2 h 30 min Mid-Ohio | 38 | #005 | Boutsen / Wollek | Champion Motors | 6th |
| 21.6.1998 | 3 h 45 min Road Atlanta | 38 | #005 | Boutsen / Wollek | Champion Motors | 3rd |
| 28.6.1998 | CDN GT Shannonville Trilllium Trophy | 00 | #107 | Klaus Bytzek | BMS Race Team | 1st |
| 28.6.1998 | 1 h 45 min Minneapolis | 38 | #005 | Boutsen / Wollek | Champion Motors | 4th |
| 12.7.1998 | British GT Silverstone | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50 Racing | 1st |
| 12.7.1998 | CDN GT Shannonville Canaska Cup | 00 | #107 | Klaus Bytzek | BMS Race Team | 1st |
| 12.7.1998 | British GT Silverstone | 11 | | Leslie / Neal | NCK Racing Ltd. | 3rd |
| 12.7.1998 | 500 km Dijon | 17 | | Wollek / Rosenblad / Goueslard | Larbre Competition | 8th |
| 19.7.1998 | 500 km Hungaroring | 17 | | Goueslard / Leconte / Chéreau | Larbre Competition | DNF |
| 26.7.1998 | CDN GT Mont-Tremblant | 00 | #102 | Klaus Bytzek | BMS Race Team | 1st |
| 26.7.1998 | CDN GT Mont-Tremblant | 00T | | Klaus Bytzek | BMS Race Team | unused |
| 2.8.1998 | British GT Donington | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | 1st |
| 16.8.1998 | CDN GT Mosport BARC GP Ontario | 00 | #102 | Klaus Bytzek | BMS Race Team | DQ |
| 16.8.1998 | CDN GT Mosport BARC GP Ontario | 201 | #108 | Joel Reiser | Reiser-Callas | 7th |
| 23.8.1998 | British GT Silverstone | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | DNF |
| 23.8.1998 | 6 h Watkins Glen | 38 | #005 | Boutsen / Kelleners | Champion Motors | 3rd |
| 30.8.1998 | CDN GT Mosport | 00 | #102 | Klaus Bytzek | BMS Race Team | 2nd |
| 30.8.1998 | CDN GT Mosport | 201 | #108 | Joel Reiser | Reiser-Callas | DNA |
| 7.9.1998 | CDN GT Mosport CRDA | 00 | #102 | Klaus Bytzek | BMS Race Team | 1st |
| 7.9.1998 | CDN GT Mosport CRDA | 201 | #108 | Joel Reiser | Reiser-Callas | 20th |
| 19.9.1998 | 3 h Sebring | 77 | | Law / Marshall | G & W Motorsports | 17th |
| 20.9.1998 | CDN GT Mosport BEMC Summer | 00 | #107 | Klaus Bytzek | BMS Race Team | 1st |
| 20.9.1998 | CDN GT Mosport BEMC Summer | 201 | #108 | Joel Reiser | Reiser-Callas | 5th |
| 27.9.1998 | British GT Spa | 0 | #101 | Greasley / Wallinder | Blue Coral/Slick 50/Quaker State | DNS |
| 4.10.1998 | British GT Silverstone | 0 | #101 | Wallinder / Kaufmann | Blue Coral/Slick 50/Quaker State | 2nd |
| 4.10.1998 | CDN GT Mosport CASC Celebration | 00 | #107 | Klaus Bytzek | BMS Race Team | 1st |
| 4.10.1998 | CDN GT Mosport CASC Celebration | 00T | | Harry Bytzek | | T-car |
| 4.10.1998 | CDN GT Mosport CASC Celebration | 201 | #108 | Joel Reiser | Reiser-Callas | 5th |
| 10.10.1998 | Petit Le Mans | 38 | #005 | Boutsen / Wollek / Kelleners | Dave Maraj | 3rd |
| 25.10.1998 | 500 km Laguna Seca | 17 | | | Larbre Competition | DNA |