Engine Oil Additives/Engine Oil Flushes
Do not add anything to the oil.
The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.
See also:
Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if ...
New Vehicle Break-In
Notice: The vehicle does not need an elaborate break-in.
But it will perform better in the long run if you follow these guidelines:
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Overview
GMC Savana is engineered with an understanding of how you rely on a full-size
van to get the job done right – whether it’s transporting up to 15 people in
comfort in a Passenger Van, or moving ...