| 7.1.2018 | Daytona Test | 5 | #P217-003 | Albuquerque / Fittipaldi / Barbosa | Mustang Sampling Racing | 3rd |
| 7.1.2018 | Daytona Test | 10 | #P217-009 | van der Zande / Taylor / Hunter-Reay | Konica Minolta Cadillac DPi-V.R | 4th |
| 7.1.2018 | Daytona Test | 31 | #P217-008 | Nasr / Conway / Curran / Middleton | Whelen Engineering Racing | 1st |
| 7.1.2018 | Daytona Test | 90 | #P217-011 | Cheever / McMurry / Vautier | Spirit of Daytona Racing | 2nd |
| 28.1.2018 | 24 h Daytona | 5 | #P217-003 | Albuquerque / Barbosa / Fittipaldi | Mustang Sampling Racing | 1st |
| 28.1.2018 | 24 h Daytona | 10 | #P217-009 | van der Zande / Taylor / Hunter-Reay | Konica Minolta Cadillac DPi-V.R | 45th |
| 28.1.2018 | 24 h Daytona | 31 | #P217-008 | Nasr / Conway / Middleton / Curran | Whelen Engineering Racing | 2nd |
| 28.1.2018 | 24 h Daytona | 90 | #P217-011 | McMurry / Cheever / Vautier | Spirit of Daytona Racing | 50th |
| 23.2.2018 | Sebring February Test | 5 | #P217-003 | Albuquerque / Barbosa / Fittipaldi | Mustang Sampling Racing | raced |
| 23.2.2018 | Sebring February Test | 10 | #P217-009 | Taylor / van der Zande | Konica Minolta Cadillac DPi-V.R | raced |
| 23.2.2018 | Sebring February Test | 31 | #P217-008 | Nasr / Curran / Conway | Whelen Engineering Racing | raced |
| 23.2.2018 | Sebring February Test | 90 | #P217-011 | McMurry / Vautier / Cheever | Spirit of Daytona Racing | raced |
| 17.3.2018 | 12 h Sebring | 5 | #P217-003 | Albuquerque / Barbosa / Fittipaldi | Mustang Sampling Racing | 16th |
| 17.3.2018 | 12 h Sebring | 10 | #P217-009 | van der Zande / Taylor / Hunter-Reay | Konica Minolta Cadillac DPi-V.R | 2nd |
| 17.3.2018 | 12 h Sebring | 31 | #P217-008 | Nasr / Conway / Curran | Whelen Engineering Racing | 3rd |
| 17.3.2018 | 12 h Sebring | 90 | #P217-011 | McMurry / Cheever / Vautier | Spirit of Daytona Racing | 35th |
| 14.4.2018 | 100 min Long Beach [P/GTLM] | 5 | #P217-003 | Barbosa / Albuquerque | Mustang Sampling Racing | 1st |
| 14.4.2018 | 100 min Long Beach [P/GTLM] | 10 | #P217-009 | van der Zande / Taylor | Konica Minolta Cadillac DPi-V.R | 3rd |
| 14.4.2018 | 100 min Long Beach [P/GTLM] | 31 | #P217-008 | Nasr / Curran | Whelen Engineering Racing | 7th |
| 6.5.2018 | 2 h 40 min Mid-Ohio | 5 | #P217-003 | Barbosa / Albuquerque | Mustang Sampling Racing | 4th |
| 6.5.2018 | 2 h 40 min Mid-Ohio | 10 | #P217-009 | van der Zande / Taylor | Konica Minolta Cadillac DPi-V.R | 5th |
| 6.5.2018 | 2 h 40 min Mid-Ohio | 31 | #P217-008 | Curran / Nasr | Whelen Engineering Racing | 8th |
| 2.6.2018 | 100 min Detroit | 5 | #P217-003 | Barbosa / Albuquerque | Mustang Sampling Racing | 6th |
| 2.6.2018 | 100 min Detroit | 10 | #P217-009 | van der Zande / Taylor | Konica Minolta Cadillac DPi-V.R | 5th |
| 2.6.2018 | 100 min Detroit | 31 | #P217-008 | Curran / Nasr | Whelen Engineering Racing | 1st |
| 2.6.2018 | 100 min Detroit | 90 | #P217-015 | McMurry / Vautier | Spirit of Daytona Racing | 24th |
| 1.7.2018 | 6 h Watkins Glen | 5 | | Albuquerque / Chaves / Fittipaldi | Mustang Sampling Racing | 6th |
| 1.7.2018 | 6 h Watkins Glen | 10 | #P217-009 | van der Zande / Taylor | Konica Minolta Cadillac DPi-V.R | 5th |
| 1.7.2018 | 6 h Watkins Glen | 31 | #P217-008 | Nasr / Conway / Curran | Whelen Engineering Racing | 7th |
| 1.7.2018 | 6 h Watkins Glen | 90 | #P217-015 | McMurry / Vautier | Spirit of Daytona Racing | 11th |
| 8.7.2018 | 2 h 40 min Mosport | 5 | | Fittipaldi / Albuquerque | Mustang Sampling Racing | 4th |
| 8.7.2018 | 2 h 40 min Mosport | 10 | #P217-009 | van der Zande / Taylor | Konica Minolta Cadillac DPi-V.R | 2nd |
| 8.7.2018 | 2 h 40 min Mosport | 31 | #P217-008 | Curran / Nasr | Whelen Engineering Racing | 3rd |
| 5.8.2018 | 2 h 40 min Road America | 5 | | Barbosa / Albuquerque | Mustang Sampling Racing | 7th |
| 5.8.2018 | 2 h 40 min Road America | 10 | #P217-009 | van der Zande / Taylor | Konica Minolta Cadillac DPi-V.R | 4th |
| 5.8.2018 | 2 h 40 min Road America | 31 | #P217-008 | Curran / Nasr | Whelen Engineering Racing | 3rd |
| 9.9.2018 | 2 h 40 min Laguna Seca | 5 | | Barbosa / Albuquerque | Mustang Sampling Racing | DNS |
| 9.9.2018 | 2 h 40 min Laguna Seca | 10 | #P217-009 | Taylor | Konica Minolta Cadillac DPi-V.R | 30th |
| 9.9.2018 | 2 h 40 min Laguna Seca | 31 | #P217-008 | Curran / Nasr | Whelen Engineering Racing | 5th |
| 13.10.2018 | Petit Le Mans | 5 | #P217-006 | Albuquerque / Fittipaldi / Vautier | Mustang Sampling Racing | 4th |
| 13.10.2018 | Petit Le Mans | 10 | #P217-009 | van der Zande / Taylor / Hunter-Reay | Konica Minolta Cadillac DPi-V.R | 1st |
| 13.10.2018 | Petit Le Mans | 31 | #P217-008 | Nasr / Curran / Chaves | Whelen Engineering Racing | 8th |