OnStar Services

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When to Add Engine Oil
If the oil is below the L mark for the L6 engine or the cross-hatched area at the tip of the dipstick for the V8 engine, you will need to add at least one quart/liter of oil. But you must use the ...

Certification Label
Label Example A vehicle-specific Certification label is attached to the driver side center pillar (B-pillar). The label tells the gross weight capacity of the vehicle, called the Gross Vehicle Weig ...

Three-Way Calling
Three-way calling must be supported on the cell phone and enabled by the wireless service carrier. 1. While on a call, press . 2. Say “Three-way call.”. 3. Use the dial or call command to ...