GMC duramax diesel 2016 Supplement Manual page 119

118 Service and Maintenance
Maintenance Schedule
Additional Required
Services - Normal
Perform Required Services. Check engine oil
level and oil life percentage. Change engine oil
and filter, if needed.
Replace engine air cleaner filter. (1)
Change automatic transmission fluid and filter.
(HD 6-Speed Allison Transmission Only)
Change automatic transmission external filter.
(2500/35/00 Pickup Only).
Drain and fill engine cooling system. (2)
Visually inspect accessory drive belts. (3)
Replace timing belt. (2.8L 4-Cylinder Engine)
Replace fuel filter. (6.6L 8-Cylinder Engine) (4)
Replace fuel filter. (2.8L 4-Cylinder Engine) (4)