Chevrolet 2015 Express Owner's Manual page 326

Maintenance Schedule
Additional Required
Services - Normal
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 (6).
Inspect evaporative control system. (1)
Replace engine air cleaner filter. (2)
Replace spark plugs. Inspect spark plug wires.
Drain and fill engine cooling system. (3)
Visually inspect accessory drive belts. (4)
Replace brake fluid. (5)
Footnotes Maintenance
Schedule Additional Required
Services - Normal
(1) Check all fuel and vapor lines
and hoses for proper hook-up,
routing, and condition.
(2) Or every four years, whichever
comes first.
(3) Or every five years, whichever
comes first. See Cooling System on
page 10-14.
(4) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
Service and Maintenance
(5) Or every 10 years, whichever
comes first.
(6) 2500/3500 series vehicles only.
For severe commercial use
vehicles, see Special Application
Services on page 11-7.
11-5