Choose the experts who know your GM vehicle best for your next oil change and receive a $20 instant rebate on a dexos1™ oil change or $30 instant rebate on a Mobil 1™ oil change. Present this offer to your Service Advisor at a participating GM dealership to redeem your instant rebate. This offer is private and can only be shared within the same household. Eligible on dexos1™ and Mobil 1™ oil changes only.