GMC TopKick 2007 Owner's Manual page 378

Fuel tank, fuel cap and fuel lines service
(or every 72 months, whichever occurs
first). (2) (26) †
Exhaust Gas Recirculation (EGR) system
inspection (if equipped) (or every 72 months,
whichever occurs first). (2) (27)
Thermostatically controlled engine cooling
fan service. (3) (19)
Shields and underhood insulation
service. (3) (4) (20)
Gasoline Engine: Air compressor remote
mounted air filter dry element pleated paper
air strainer service (or every 6 months or
every 1800 hours, whichever occurs first).
82,500 Miles (132 000 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)
378
Chassis lubrication service (or every 6 months,
whichever occurs first). (11)
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)