GMC Savana 2020 Owner's Manual page 310

(4) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(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.
Service and Maintenance
(7) Replace air conditioning
desiccant every seven years.
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