GMC SIERRA 2020 Owner's Manual page 447

446 Service and Maintenance
(6) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0 357.
(8) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0 364.
(9) Or every 10 years, whichever
comes first. See Gas Strut(s) 0 365.
(10) Replace air conditioning
desiccant every seven years.