GMC Savana 2020 Owner's Manual page 312

(5) Replace brake fluid every five
years. See Brake Fluid 0 240.
(6) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0 245.
(7) Replace air conditioning
desiccant every seven years.
Special Application
Services
Vehicles with Dual Wheels:
Check dual wheel nut torque at
160, 1 600, and 10 000 km (100,
1,000, and 6,000 mi) of driving.
Repeat this service whenever a
tire/wheel is serviced or
removed.
Severe Commercial Use
Vehicles Only: Lubricate chassis
components every oil change.
Have underbody flushing service
performed. See Underbody
Maintenance in Exterior Care
0 295.
Service and Maintenance
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
trained dealer 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 attention.
The following list is intended to
explain the services and conditions
to look for that may indicate
services are required.
Battery
The 12-volt battery supplies power
to start the engine and operate any
additional electrical accessories.
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their