Chevrolet T-Series Owner's Manual page 284

(8) = This vehicle has the Engine Oil Life System.
This system will show you when to change the
engine oil and filter – usually between 3,000 miles
(5 000 km) and 10,000 miles (16 000 km) since
your last oil change. Under severe conditions,
the indicator may come on before 3,000 miles
(5 000 km). Never drive your vehicle more than
10,000 miles (16 000 km) or 12 months without
an oil and filter change.
Remember to reset the Engine Oil Life System
whenever the oil is changed. For more information,
see Engine Oil Life System on page 190.
(9) = Inspect rear axle air shift motor for fluid
leaks. Remove plug to check fluid level. Inspect
air lines and hoses for proper hook-up, binding,
leaks, etc. Inspect at 1,000 miles (1 600 km)
and 22,500 miles (36 000 km) and then every
22,500 miles (36 000 km) thereafter.
284
(10) = Chassis Lubrication Service: Lubricate all
grease fittings in front suspension, front axle,
and steering linkage. DO NOT lubricate kingpin
bushings with air pressure equipment; instead,
use a hand grease gun to ensure complete purge
and eliminate sealer cap distortion. Front axle
tie rod ends, both upper and lower kingpin fittings,
and both steering linkage relay rod ends should
be greased with the vehicle loaded on the ground
and wheels turned straight ahead, NOT with
the vehicle on a hoist. Apply kingpin bushing
lubricant to both upper and lower kingpin grease
fittings until new lubricant purges from between the
upper shim pack and thrust bearing. Lubricate
transmission and shift linkage, tilt cab hinges and
latches, parking brake lever pivot, clevis pins
and linkage, disc brake caliper rails, bearing
pads, propshaft universal joints, brake camshaft
bracket, slack adjusters, and pedal shaft. Lubricate
suspension, axle, and steering linkage more
often when operating under dusty or muddy
conditions and in excessive off-road use.
Frequently power-washed vehicles will require
more frequent lubrication.