OnStar Services

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Tire Designations
Tire Size The following is an example of a typical passenger vehicle tire size. (A) Passenger (P–Metric) Tire: The United States version of a metric tire sizing system. The letter P as the ...

Continuous Damping Control (CDC)
This vehicle may have a continuous damping control system called Autoride® or MagneRide™. With this feature, improved vehicle ride and handling is provided under a variety of passenger and loading ...

Fuel E85 (85% Ethanol)
Vehicles that have a FlexFuel badge and a yellow fuel cap can use either unleaded gasoline or ethanol fuel containing up to 85% ethanol (E85). See Fuel E85 (85% Ethanol). For all other vehicles, u ...