GMC Sierra 2023 Manual page 149

148 Service and Maintenance
Because of the way people use vehicles,
maintenance needs vary. There may need to
be more frequent checks and services. The
Additional Required Services - Normal are for
vehicles that:
Carry passengers and cargo within
recommended limits on the Tire and
Loading Information label. See Vehicle
Load Limits 0 75.
Are driven on reasonable road surfaces
within legal driving limits.
Use the recommended fuel. See your
owner s manual.
Refer to the information in the Maintenance
Schedule Additional Required Services -
Normal Service.
The Additional Required Services - Severe are
for vehicles that are:
Mainly driven in heavy city traffic in hot
weather.
Mainly driven in hilly or mountainous
terrain.
Frequently towing a trailer.
Used for high speed or competitive
driving.
Used for taxi, police, or delivery service.
Refer to the information in the Maintenance
Schedule Additional Required Services -
Severe Service.
Warning
Performing maintenance work can be
dangerous and can cause serious injury.
Perform maintenance work only if the
required information, proper tools, and
equipment are available. If they are not,
see your dealer to have a trained
technician do the work. See Doing Your
Own Service Work 0 110.
Additional Maintenance
and Care
Windshield
For safety, appearance, and the best
viewing, keep the windshield clean and
clear.
Signs of damage include scratches, cracks,
and chips.
Trained dealer technicians can inspect the
windshield and recommend proper
replacement if needed.
Clean the outside of the windshield with
glass cleaner.
Wiper Blades
Wiper blades need to be cleaned and kept in
good condition to provide a clear view.
Signs of wear include streaking, skipping
across the windshield, and worn or split
rubber.
Trained dealer technicians can check the
wiper blades and replace them when
needed.
Clean rubber blades using a lint-free cloth or
paper towel soaked with windshield washer
fluid or a mild detergent. Wash the
windshield thoroughly when cleaning the
blades. Bugs, road grime, sap, and a buildup
of vehicle wash/wax treatments may cause
wiper streaking.
Replace the wiper blades if they are worn or
damaged. Damage can be caused by
extreme dusty conditions, sand, salt, heat,
sun, snow, and ice.
Interior Glass
To clean, use a microfiber cloth fabric
dampened with water. Wipe droplets left
behind with a clean dry cloth. If necessary,
use a commercial glass cleaner after
cleaning with plain water.