O Peak Antifreeze & Motor Oil Indy Grand Prix of Sonoma County de 2008 foi a décima quinta corrida da temporada de 2008 da IndyCar Series. A corrida foi disputada no dia 24 de agosto no Infineon Raceway, localizado na cidade de Sonoma, Califórnia. O vencedor foi o brasileiro Hélio Castroneves, da equipe Team Penske.
Pilotos e equipes Nº Piloto Equipe Chassis Motor Pneu 2 A. J. Foyt IV Vision Racing Dallara Honda 3 Hélio Castroneves Team Penske Dallara Honda 4 Vitor Meira Panther Racing Dallara Honda 5 Oriol Servià (R) KV Racing Technology Dallara Honda 6 Ryan Briscoe Team Penske Dallara Honda 7 Danica Patrick Andretti-Green Racing Dallara Honda 8 Will Power (R) KV Racing Technology Dallara Honda 9 Scott Dixon Chip Ganassi Racing Dallara Honda 10 Dan Wheldon Chip Ganassi Racing Dallara Honda 11 Tony Kanaan Andretti-Green Racing Dallara Honda 12 Tomas Scheckter Luczo Dragon Racing Dallara Honda 14 Darren Manning A. J. Foyt Enterprises Dallara Honda 15 Buddy Rice Dreyer & Reinbold Racing Dallara Honda 17 Ryan Hunter-Reay Rahal Letterman Racing Dallara Honda 18 Bruno Junqueira Dale Coyne Racing Dallara Honda 19 Mario Moraes (R) Dale Coyne Racing Dallara Honda 20 Ed Carpenter Vision Racing Dallara Honda 23 Townsend Bell Dreyer & Reinbold Racing Dallara Honda 25 Marty Roth Roth Racing Dallara Honda 26 Marco Andretti Andretti-Green Racing Dallara Honda 27 Hideki Mutoh (R) Andretti-Green Racing Dallara Honda 33 E. J. Viso (R) HVM Racing Dallara Honda 34 Jaime Câmara (R) Conquest Racing Dallara Honda 36 Enrique Bernoldi (R) Conquest Racing Dallara Honda 96 Mario Domínguez (R) Pacific Coast Motorsports Dallara Honda 02 Justin Wilson (R) Newman/Haas/Lanigan Racing Dallara Honda 06 Graham Rahal (R) Newman/Haas/Lanigan Racing Dallara Honda (R) - Rookie
Resultados Treino classificatório {| class="wikitable" style="font-size:95%" |- ! colspan="9" | Treino classificatório - 23 de agosto |- ! rowspan="2" | Pos. ! rowspan="2" | Nº ! rowspan="2" width="180" | Piloto ! rowspan="2" width="250" | Equipe ! width="120" colspan="2" | Q1 ! rowspan="2" width="70" | Q2 ! rowspan="2" width="70" | Q3 |- ! width="70" | Grupo 1 ! width="70" | Grupo 2 |- ! 1 | 3 | Hélio Castroneves | Team Penske | | align="center" | 1:17.0477 | align="center" | 1:16.6819 | align="center" | 1:16.9027 |- ! 2 | 6 | Ryan Briscoe | Team Penske | | align="center" | 1:17.0343 | align="center" | 1:16.7409 | align="center" | 1:16.9185 |- ! 3 | 8 | Will Power (R) | KV Racing Technology | | align="center" | 1:16.9543 | align="center" | 1:16.8946 | align="center" | 1:17.0875 |- ! 4 | 11 | Tony Kanaan | Andretti-Green Racing | align="center" | 1:17.3636 | | align="center" | 1:16.7244 | align="center" | 1:17.1286 |- ! 5 | 9 | Scott Dixon | Chip Ganassi Racing | | align="center" | 1:17.1941 | align="center" | 1:16.8413 | align="center" | 1:17.6682 |- ! 6 | 5 | Oriol Servià (R) | KV Racing Technology | align="center" | 1:17.1462 | | align="center" | 1:16.8433 | align="center" | 1:17.8377 |- ! 7 | 02 | Justin Wilson (R) | Newman/Haas/Lanigan Racing | | align="center" | 1:17.3021 | align="center" | 1:17.0056
! 8 | 17 | Ryan Hunter-Reay | Rahal Letterman Racing | align="center" | 1:17.5547 | | align="center" | 1:17.0378
! 9 | 7 | Danica Patrick | Andretti-Green Racing | | align="center" | 1:17.2155 | align="center" | 1:17.0458
! 10 | 26 | Marco Andretti | Andretti-Green Racing | align="center" | 1:17.4633 | | align="center" | 1:17.2705
! 11 | 96 | Mario Domínguez (R) | Pacific Coast Motorsports | align="center" | 1:17.7082 | | align="center" | 1:17.4614
! 12 | 19 | Mario Moraes (R) | Dale Coyne Racing | align="center" | 1:17.8039 | | align="center" | 1:17.5882
! 13 | 18 | Bruno Junqueira | Dale Coyne Racing | align="center" | 1:17.8306
! 14 | 33 | E. J. Viso (R) | HVM Racing | | align="center" | 1:17.4189
! 15 | 06 | Graham Rahal (R) | Newman/Haas/Lanigan Racing | align="center" | 1:17.9012
! 16 | 10 | Dan Wheldon | Chip Ganassi Racing | | align="center" | 1:17.4738
! 17 | 12 | Tomas Scheckter | Luczo Dragon Racing | align="center" | 1:18.1238
! 18 | 4 | Vitor Meira | Panther Racing | | align="center" | 1:17.5399
! 19 | 23 | Townsend Bell | Dreyer & Reinbold Racing | align="center" | 1:18.3267
! 20 | 27 | Hideki Mutoh (R) | Andretti-Green Racing | | align="center" | 1:18.0038
! 21 | 14 | Darren Manning | A. J. Foyt Enterprises | align="center" | 1:18.3885
! 22 | 15 | Buddy Rice | Dreyer & Reinbold Racing | | align="center" | 1:38.3892
! 23 | 20 | Ed Carpenter | Vision Racing | align="center" | 1:18.4034
! 24 | 2 | A. J. Foyt IV | Vision Racing | | align="center" | 1:18.3715
! 25 | 25 | Marty Roth | Roth Racing | align="center" | 1:19.9435
! 26 | 34 | Jaime Câmara (R) | Conquest Racing | | align="center" | 1:19.4711
! 27 | 36 | Enrique Bernoldi (R) | Conquest Racing | | align="center" | sem tempo
! colspan="9" | Relatório |} (R) - Rookie Corrida Corrida - 24 de agosto Pos Nº Piloto Equipe Voltas Tempo Largada Voltas naLiderança Pontos 1 3 Hélio Castroneves Team Penske 80 1:50:15.8282 1 51 53 2 6 Ryan Briscoe Team Penske 80 +5.2926 2 19 40 3 11 Tony Kanaan Andretti-Green Racing 80 +16.6032 4 1 35 4 10 Dan Wheldon Chip Ganassi Racing 80 +17.7720 16 0 32 5 7 Danica Patrick Andretti-Green Racing 80 +25.8458 9 0 30 6 33 E. J. Viso (R) HVM Racing 80 +29.3472 14 9 28 7 4 Vitor Meira Panther Racing 80 +29.9895 18 0 26 8 06 Graham Rahal (R) Newman/Haas/Lanigan Racing 80 +40.4577 15 0 24 9 02 Justin Wilson (R) Newman/Haas/Lanigan Racing 80 +42.0357 7 0 22 10 19 Mario Moraes (R) Dale Coyne Racing 80 +50.0106 12 0 20 11 15 Buddy Rice Dreyer & Reinbold Racing 80 +55.0361 22 0 19 12 9 Scott Dixon Chip Ganassi Racing 80 +55.7145 5 0 18 13 27 Hideki Mutoh (R) Andretti-Green Racing 80 +56.3186 20 0 17 14 26 Marco Andretti Andretti-Green Racing 80 +57.5400 10 0 16 15 5 Oriol Servià (R) KV Racing Technology 80 +58.3690 6 0 15 16 96 Mario Domínguez (R) Pacific Coast Motorsports 80 +1:00.7387 11 0 14 17 18 Bruno Junqueira Dale Coyne Racing 80 +1:00.9454 13 0 13 18 17 Ryan Hunter-Reay Rahal Letterman Racing 80 +1:00.9466 8 0 12 19 23 Townsend Bell Dreyer & Reinbold Racing 79 +1 volta 19 0 12 20 2 A. J. Foyt IV Vision Racing 79 +1 volta 24 0 12 21 36 Enrique Bernoldi (R) Conquest Racing 79 +1 volta 27 0 12 22 14 Darren Manning A. J. Foyt Enterprises 79 +1 volta 21 0 12 23 20 Ed Carpenter Vision Racing 78 +2 voltas 23 0 12 24 34 Jaime Câmara (R) Conquest Racing 78 +2 voltas 26 0 12 25 4 Will Power (R) KV Racing Technology 77 +3 voltas 3 0 10 26 25 Marty Roth Roth Racing 76 +4 voltas 25 0 10 27 12 Tomas Scheckter Luczo Dragon Racing 56 Mecânico 17 0 10 Relatório (R) - Rookie''
Categoria:GPs da IndyCar Series de 2008