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*Available on 2004 MY & newer GM models equipped with the GM Oil Life System. Diagnostics not available on Cadillac Catera, Pontiac Vibe and Saab 9-3 and 9-5. Diagnostic services vary on Cadillac SRX V8, Saturn VUE, Ion and L-Series, Chevy Silverado diesel and GMC Sierra diesel. For details, call 1-888-4-ONSTAR (1-888-466-7827).