GMC Chevrolet Express 2022 Owner's Manual page 227

226 Service and Maintenance
Every 240 000 km
Drain and fill engine cooling system. Or
every five years, whichever comes first.
See Cooling System 0 173.
Visually inspect accessory drive belts. Or
every 10 years, whichever comes first.
Inspect for fraying, excessive cracking,
or damage; replace, if needed.
Severe Conditions Requiring More
Frequent Maintenance*
Public service, military, or commercial use
vehicles to include the following:
Ambulances, police cars and emergency
rescue vehicles.
Civilian vehicles such as light duty
pick-up trucks, SUVs and passenger cars
that are used in military applications.
Recovery vehicles such as tow trucks
and flatbed single vehicle carriers or
any vehicle that is consistently used in
towing trailers or other loads.
High use commercial vehicles such as
courier delivery vehicles, private
security patrol vehicles or any vehicles
that operate on a 24 hour basis.
Any vehicle consistently operated in a
high sand or dust environment such as
those used on oil pipelines and similar
applications.
Vehicles that are regularly used for short
trips of 6 km or less.
The Oil Life Indicator will show when to
change the oil and filter. Under severe
conditions the indicator may come on
before 10 000 km. The indicator will not
detect dust in the oil, so if you drive in a
dusty area you may have to change the
oil and filter sooner than every
10 000 km.
* Footnote: Under extreme driving
conditions listed above, it may be
necessary to replace the spark plugs at
more frequent intervals. For further
assistance in determining the most
suitable service maintenance intervals for
your vehicle, contact your authorized GM
dealer.
Additional Required Services
Service
Every 70 000 km
Change automatic transmission fluid and
filter.
Special Application Services
Severe Commercial Use Vehicles Only:
Lubricate chassis components every oil
change.
Have underbody flushing service
performed. See "Underbody Maintenance"
in Exterior Care 0 215.
Additional Maintenance
and Care
Your vehicle is an important investment and
caring for it properly may help to avoid
future costly repairs. To maintain vehicle
performance, additional maintenance
services may be required.
It is recommended that your dealer perform
these services
technicians know your vehicle best. Your
dealer can also perform a thorough
assessment with a multi-point inspection to
recommend when your vehicle may need
Severe
attention.
The following list is intended to explain the
services and conditions to look for that may
indicate services are required.
their trained dealer