OnStar Services

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Removing the Spare Tire and Tools
The equipment you need is located in the trunk. 1. Open the trunk. 2. Remove the spare tire cover. 3. Turn the retainer nut counterclockwise and remove the spare tire. 4. Place the spare t ...

Gasoline Octane
If the vehicle has the 3.9L V6 engine (VIN Code 1) or the 3.9L V6 engine (VIN Code M), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less tha ...

How to Check Automatic Transmission Fluid (3.9L Engine)
Because this operation can be a little difficult, you may choose to have this done at the dealer/retailer service department. If you do it yourself, be sure to follow all the instructions here, ...