GMC Savana 2020 Owner's Manual page 311

310 Service and Maintenance
Maintenance Schedule
Additional Required
Services - Severe
Rotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.
Lubricate the steering linkage.
Inspect evaporative control system. (1)
Replace engine air cleaner filter. (2)
Change automatic transmission fluid and filter.
Replace spark plugs. Inspect spark plug wires
and/or boots.
Drain and fill engine cooling system. (3)
Visually inspect accessory drive belts. (4)
Replace brake fluid. (5)
Replace windshield wiper blades. (6)
Replace air conditioning desiccant. (7)
Footnotes Maintenance
Schedule Additional Required
Services - Severe
(1) Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(2) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
See Engine Air Cleaner/Filter 0 230.
(3) Or every five years, whichever
comes first. See Cooling System
0 231.
(4) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.