Chevrolet Kodiak 2006 Owner's Manual page 341

Diesel Engine: 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 5-35 for more
information.
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DURAMAX Diesel Only: Replace fuel filter
(or every 750 hours of engine operation, whichever
occurs first).
Steering system service. (12)
Front and rear suspension service. (13)
Spring-to-axle U-bolts and shackle bolts service. (15)
Exhaust system service (or every 6 months,
whichever occurs first). (2) (3) (16)
Wheels and tires service. (14)
Hydraulic brake service (or every 6 months,
whichever occurs first). (6) (36)
Parking brake service (or every 6 months, whichever
occurs first). (21)
Air brake service (or every 6 months, whichever
occurs first). (32)
Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (33)
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). (34)
Thermostatically controlled engine cooling fan
service. (3) (19)
Shields and underhood insulation service. (3) (4) (20)
Air compressor dry element pleated paper air
strainer service (or every 2 months or every
800 hours, whichever occurs first).
22,500 Miles (36 000 km)
Gasoline Engine Only: Check engine oil life system.
If engine oil and filter are changed, reset system.
See "Engine Oil (Gasoline Engine)" in the
Index. (2) (8)
Check fluid levels (or every 3 months, whichever
occurs first). (1) (5)
Chassis lubrication service (or every 6 months,
whichever occurs first). (11)
6-7