GMC T-Series 2007 Owner's Manual page 300

45,000 Miles (72 000 km)
❑ Vehicles Without Engine Oil Life System Only:
Change engine oil and filter (or every 12 months,
or every 750 hours of engine operation,
whichever occurs first). (2)
❑ Vehicles With Engine Oil Life System Only:
Check oil life system (or every 12 months, or
every 750 hours of engine operation, whichever
occurs first). If engine oil and filter are changed,
reset system. See Engine Oil Life System on
page 209. (2) (8)
❑ Inspect engine air cleaner filter change indicator.
If necessary, replace the filter. If vehicle is driven
in dusty/dirty conditions, inspect filter change
indicator at every engine oil change. See Engine
Air Cleaner/Filter on page 211 for more
information.
❑ Check fluid levels (or every 3 months, whichever
occurs first). (1) (5)
❑ Replace fuel filter (or every 750 hours of engine
operation, whichever occurs first).
❑ Chassis lubrication service (or every 6 months,
whichever occurs first). (10)
300
❑ Cooling system service. Clean the cooling
system filler cap with clean water, clean the
core, pressure test the cap and the system for
proper pressure capability, and inspect the
condition of cooling and heater hoses and
clamps. Replace hoses if cracked, swollen,
or damaged.
❑ Inspect door hinge pins and bushings and
replace as necessary.
❑ Steering system service. (11)
❑ Front and rear suspension service. (12)
❑ Spring-to-axle U-bolts and shackle bolts
service. (14)
❑ Exhaust system service (or every 6 months,
whichever occurs first). (2) (3) (15)
❑ Wheels and tires service. (13)
❑ Hydraulic brake service (or every 6 months,
whichever occurs first). (6) (30)
❑ Parking brake service (or every 6 months,
whichever occurs first). (7)
❑ Air brake service (or every 6 months, whichever
occurs first). (26)
❑ Air brake automatic slack adjuster service
(or every 500 hours, whichever occurs first). (27)