Chevrolet 2008 T Series Owner's Manual page 253

Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours, whichever
occurs first).
Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first). Lubricate
linkage.
Air brake chamber service (or every 2 months,
whichever occurs first). (28)
60,000 Miles (96 000 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) (33)
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 5-20. (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 5-21 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)
Inspect door hinge pins and bushings and replace as
necessary.
Check restraint system. (34)
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)
Wheel bearing (grease type) service (and whenever
hubs are removed). (19) (30)
Wheels and tires service. (13)
Adjust valve lash (or every 2,625 hours of engine
operation, whichever occurs first). (16)
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)
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