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:
Interior
Like the previous Seville, five occupants fit inside the STS, which has soft
all-leather seats. Heated and ventilated seating is an option. The headliner and
pillars are covered in woven fabric. G ...
Navigation
OnStar navigation requires the Directions and Connections service plan.
Push to receive directions or have
them sent to the vehicle navigation screen. Destinations can also be forwarded to
the v ...
Running the Vehicle
While Parked
It is better not to park with the
engine running. But if you ever have
to, here are some things to know.
WARNING!
Idling a vehicle in an enclosed
area with poor ventilation is
dangerous. Eng ...