Recommended Fuel
Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.
See also:
When the System Does Not Seem To Work Properly
The RVC system might not work properly or display a clear image if:
• The RVC is turned off. See “Turning the RVC System On or Off” earlier in this section.
• It is dark.
• The sun or the ...
Selecting the Right Engine Oil
Selecting the right engine oil depends on both the proper oil specification and viscosity grade.
See Recommended Fluids and Lubricants on page 11‑12. ...
Transferring Service
Push to request account transfer
eligibility information. The Advisor can assist in canceling or removing account
information. If OnStar receives information that vehicle ownership has changed,
...





