GMC Cadillac CT5 2021 Manual page 387

386 SERVICE AND MAINTENANCE
Maintenance Schedule
Additional Required Services -
Severe
Rotate tires, if recommended for the vehicle, and
perform Required Services. (1) Check engine oil level
and oil life percentage. Change engine oil and filter,
if needed.
If equipped, check engine air filter life percentage
and status. Change engine air filter, if needed.
Replace passenger compartment air filter. (2)
If the vehicle is not equipped with the engine air
filter life system, replace engine air cleaner filter. (3)
Inspect evaporative control system. (4)
Replace spark plugs. Inspect spark plug wires and/or
boots.
Change automatic transmission fluid and filter.
Change transfer case fluid, if equipped with
AWD. (5)
Change rear axle fluid, if equipped with limited slip
differential. (5)
Change rear axle fluid, without limited slip
differential. (5)
Change front axle fluid, if equipped with AWD. (5)
Drain and fill engine cooling system. (6)
Visually inspect accessory drive belts. (7)
Replace brake fluid. (8)
Replace windshield wiper blades. (9)