Diagnostics
OnStar Vehicle Diagnostics will
perform a vehicle check every
month. It will check the engine,
transmission, antilock brakes, and
major vehicle systems. It also
checks the tire pressures, if the
vehicle is equipped with the Tire
Pressure Monitoring System. If a
diagnostics check is needed
between e-mails, push 
, and
an Advisor can run a check.
See also:
Off-Road Recovery
The vehicle's right wheels can
drop off the edge of a road onto
the shoulder while driving.
Follow these tips:
1. Ease off the accelerator and
then, if there is nothing in the
way, steer t ...
Viscosity Grade
SAE 5W–30 is the best viscosity
grade for the vehicle. Do not use
other viscosity grade oils such as
SAE 10W–30, 10W–40, or 20W–50.
If in an area of extreme cold,
where the temperature falls ...
Interior Care
To prevent dirt particle abrasions, regularly clean the vehicle's interior. Immediately
remove any soils. Note that newspapers or dark garments that can transfer color
to home furnishings can ...