GMC 1996 Sonoma Owner's Manual page 332

Long Tripmighway Maintenance Schedule
I
60,000 Miles (100 000 km)
0
Change engine oil and filter (or every
12 months, whichever occurs first).
An Emission Control Service.
0
Lubricate the front suspension, ball joints,
steering linkage and transfer case shift
linkage, parking brake cable guides,
propshaft splines, universal joints, brake
pedal springs and clutch pedal springs at
every oil change (or every 12 months,
whichever occurs first).
0
Check readfront axle fluid level and add
fluid as needed. Check constant velocity
joints and axle seals for leaking.**
0
For Two-Wheel-Drive vehicles only: Clean
and repack the front wheel bearings (or at
each brake relining, whichever occurs first).
0
Inspect engine accessory drive belt.
0
Replace fuel filter.
An Emission Control Service.?
0
Replace air cleaner filter.
An Emission Control Service.
0
Inspect fuel tank, cap and lines for damage
or leaks. Inspect fuel cap gasket for any
damage. Replace parts as needed.
An Emission Control Service.
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