Dexos 1 Engine Oil - GM Vehicles
For 2011 GM requires an engine oil that meets the approved dexos specification.
Are you using an engine oil that meets the dexos specifications in 2011 GM vehicles?
Are you using one type of oil for GM vehicles and a different oil for the other vehicles or one oil for all gas powered vehicles?
Are you using time and mileage or the change oil light to determine when to change oil?