| 11.1.1998 | Daytona Test | 6 | #E36/102292 | Said / Simo / Auberlen / Valentine / Bentley / Papadopoulos | Prototype Technology Group, Inc. | 28th |
| 11.1.1998 | Daytona Test | 7 | #E36 STC 95 020 | Said / Papadopoulos / Valentine / Auberlen / Donohue | Prototype Technology Group, Inc. | 25th |
| 11.1.1998 | Daytona Test | 54 | | Neuman / Pilgrim / Hernandez / Borcheller / Adam | Bell Motorsports | 27th |
| 1.2.1998 | 24 h Daytona | 6 | #E36/102292 | Simo / Cunningham / Quester | Prototype Technology Group | 67th |
| 1.2.1998 | 24 h Daytona | 7 | #E36 STC 95 020 | Bentley / Delano / Petery / Hill | Prototype Technology Group Inc. | 16th |
| 1.2.1998 | 24 h Daytona | 10 | #E36 STC 95 002 | Auberlen / Duez / Said / Cunningham | Prototype Technology Group | 6th |
| 1.2.1998 | 24 h Daytona | 54 | | Hayner / Taleb / Neuman / Borcheller | Bell Motorsports | 33rd |
| 21.3.1998 | 300 km Suzuka | 21 | | Hitotsuyama / Katou | Hitotsuyama Racing | DNF |
| 22.3.1998 | 12 h Sebring | 1 | #E36 STC 95 020 | Carter / Petery / Amati | Prototype Technology Group | 32nd |
| 22.3.1998 | 12 h Sebring | 6 | #E36/102292 | Cunningham / Bentley / Simo | Prototype Technology Group | 12th |
| 22.3.1998 | 12 h Sebring | 10 | #E36 STC 95 002 | Auberlen / Said | Prototype Technology Group | 11th |
| 22.3.1998 | 12 h Sebring | 54 | | de Quesada / Borcheller / Neuman / Varde | Bell Motorsports | 38th |
| 26.4.1998 | 3 h 45 min Las Vegas | 1 | #E36 STC 95 020 | Cunningham / Bentley | Prototype Technology Group | 6th |
| 26.4.1998 | 3 h 45 min Las Vegas | 6 | #E36/102292 | Pilgrim / Said / Auberlen | Prototype Technology Group | 4th |
| 26.4.1998 | 3 h 45 min Las Vegas | 10 | #E36 STC 95 002 | Auberlen / Simo / Duez | Prototype Technology Group | 5th |
| 2.5.1998 | All Japan GT Fuji | 21 | | Hitotsuyama / Kinoshita | Hitotsuyama Racing | NC |
| 17.5.1998 | 2 h 15 min Homestead | 1 | #E36 STC 95 020 | Bentley / Duez | Prototype Technology Group | 7th |
| 17.5.1998 | 2 h 15 min Homestead | 6 | #E36/102292 | Said / Simo / Auberlen | Prototype Technology Group | DNA |
| 17.5.1998 | 2 h 15 min Homestead | 10 | #E36 STC 95 002 | Said / Simo | Prototype Technology Group | 8th |
| 17.5.1998 | 2 h 15 min Homestead | 54 | | Newman / Pilgrim / Borcheller | Bell Motorsports | 15th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 1 | #E36 STC 95 020 | Bentley / Cunningham | Prototype Technology Group | 5th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 6 | #E36/102292 | Said / Duez | Prototype Technology Group | 4th |
| 25.5.1998 | 1 h 45 min Lime Rock [GT] | 10 | #E36 STC 95 002 | Auberlen / Simo | Prototype Technology Group | 7th |
| 14.6.1998 | 24 h Nürburgring | 1 | | Kather / Grohs / Deutgen / Funke | Dürener Motorsport Club e. V. im ADAC | 3rd |
| 14.6.1998 | 2 h 30 min Mid-Ohio | 1 | #E36 STC 95 020 | Bentley / Simo | Prototype Technology Group | 11th |
| 14.6.1998 | 2 h 30 min Mid-Ohio | 10 | #E36 STC 95 002 | Auberlen / Said | Prototype Technology Group | 9th |
| 14.6.1998 | 24 h Nürburgring | 20 | | O'Dell / Mäkinen / Arho / Mätsala | Moore International Motorsport | 30th |
| 14.6.1998 | 2 h 30 min Mid-Ohio | 54 | | Newman / Pilgrim / Borcheller | Bell Motorsports | DNA |
| 14.6.1998 | 24 h Nürburgring | 58 | | Möller / Felder / Furtmayr | Renngemeinschaft Bergisch-Gladbach e. V. im ADAC | DNF |
| 14.6.1998 | 24 h Nürburgring | 84 | | Wolfsgruber / Gehring / Weis / Pfrommer | | 12th |
| 14.6.1998 | 24 h Nürburgring | 102 | | Springer / Kralik / Anspann / Deiser | | 16th |
| 14.6.1998 | 24 h Nürburgring | 126 | | Moore / Cox / McLaren | Moore International Motorsport | DNF |
| 21.6.1998 | 3 h 45 min Road Atlanta | 1 | #E36 STC 95 020 | Cunningham / Bentley | Prototype Technology Group | 14th |
| 21.6.1998 | 3 h 45 min Road Atlanta | 6 | #E36/102292 | Said / Simo / Duez | Prototype Technology Group | 10th |
| 21.6.1998 | 3 h 45 min Road Atlanta | 10 | #E36 STC 95 002 | Simo / Auberlen | Prototype Technology Group | 13th |
| 21.6.1998 | 2 h Zeltweg | | | Zadra / Zadra | | 9th |
| 21.6.1998 | 2 h Zeltweg | | | Meloni / Meloni | | 6th |
| 21.6.1998 | 2 h Zeltweg | | | Brand / Matteuzzi | | 5th |
| 21.6.1998 | 2 h Zeltweg | | | Benedetti / Bagnasco | | 10th |
| 21.6.1998 | 2 h Zeltweg | | | Del Castello / Marini | | 18th |
| 21.6.1998 | 2 h Zeltweg | | | Alexander / Quester | | 17th |
| 21.6.1998 | 2 h Zeltweg | | | Cappellari / Duller | | 15th |
| 27.6.1998 | Hi-Land GT Sendai | 21 | | Hitotsuyama / Katou | Hitotsuyama Racing | 14th |
| 28.6.1998 | 1 h 45 min Minneapolis | 6 | #E36/102292 | Cunningham / Simo | Prototype Technology Group | 10th |
| 28.6.1998 | 1 h 45 min Minneapolis | 10 | #E36 STC 95 002 | Bentley / Simo | Prototype Technology Group | 9th |
| 8.8.1998 | Special GT Cup Fuji | 21 | | Hitotsuyama / Katou | Hitotsuyama Racing | 19th |
| 9.8.1998 | 2 h 45 min Mosport | 1 | #E36 STC 95 020 | Bentley / Cunningham | Prototype Technology Group | 10th |
| 9.8.1998 | 2 h 45 min Mosport | 6 | #E36/102292 | Bentley / Duez | Prototype Technology Group | 11th |
| 9.8.1998 | 2 h 45 min Mosport | 10 | #E36 STC 95 002 | Auberlen / Simo | Prototype Technology Group | 9th |
| 23.8.1998 | 6 h Watkins Glen | 6 | #E36/102292 | Bentley / Duez / Cunningham | Prototype Technology Group | 15th |
| 23.8.1998 | 6 h Watkins Glen | 10 | #E36 STC 95 002 | Auberlen / Simo | Prototype Technology Group | 26th |
| 12.9.1998 | Motegi GT | 21 | | Hitotsuyama / Katou | Hitotsuyama Racing | 14th |
| 19.9.1998 | 3 h Sebring | 6 | #E36/102292 | Cunningham / Bentley | Prototype Technology Group | 13th |
| 19.9.1998 | 3 h Sebring | 10 | #E36 STC 95 002 | Auberlen / Simo | Prototype Technology Group | 14th |
| 19.9.1998 | 3 h Sebring | 54 | | Neuman / Pilgrim | Bell Motorsports | 9th |
| 10.10.1998 | Petit Le Mans | 1 | #E36 STC 95 039 | Cunningham / Simo / Borcheller / Quiros | Prototype Technology Group | 16th |
| 10.10.1998 | Petit Le Mans | 6 | #E36/102292 | Bentley / Law / Shafer / Besnard | Prototype Technology Group | 10th |
| 10.10.1998 | Petit Le Mans | 10 | #E36 STC 95 002 | Auberlen / Simo / Pilgrim | Prototype Technology Group | 17th |
| 10.10.1998 | Petit Le Mans | 12 | #E36 STC 95 020 | Halsmer / Pobst | T. C. Kline | 23rd |
| 10.10.1998 | 250 km Mine | 21 | | Hitotsuyama / Katou | Hitotsuyama Racing | 19th |
| 24.10.1998 | Sugo GT | 21 | | Hitotsuyama / Katou | Hitotsuyama Racing | 14th |
| 25.10.1998 | 2 h 30 min Laguna Seca | 1 | #E36 STC 95 020 | Auberlen / Cunningham | Prototype Technology Group | 17th |
| 25.10.1998 | 2 h 30 min Laguna Seca | 6 | #E36/102292 | Cunningham / Simo | Prototype Technology Group | 12th |
| 25.10.1998 | 2 h 30 min Laguna Seca | 10 | #E36 STC 95 002a | Bentley | Prototype Technology Group | 27th |