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:
Automatic Transmission
The automatic transmission has a shift lever located on the console between the seats.
P (Park): This position locks the front wheels. It is the best position to use when starting the engine becaus ...
Performance
One reason the Acadia gets better gas mileage than traditional SUVs is its
V-6 engine. Many full-size SUVs are offered with thirsty V-8s, but the Acadia
only comes with a 3.6-liter V-6 that produc ...
Onstar.com
The website provides access to account information, manages the OnStar subscription, and allows viewing of videos of each service.
Get subscription plan pricing and sign up for OnStar Vehicle Diagnos ...