GMC 1998 Sonoma Owner's Manual page 331

I
Short Trip/City Maintenance Schedule
I
3,000 Miles (5 000 km)
0
Change engine oil and filter (or every 3 months, whichever occurs first).
0
Lubricate chassis components (or every 3 months, whichever occurs first).
0
Check readfront axle fluid level and add fluid as needed. Check constant
An Emission Control Service.
(See footnote
#.)
velocity joints and axle seals for leaking. (See footnote
**.)
6,000 Miles (I 0 000 km)
0
Change engine oil and filter (or every 3 months, whichever occurs first).
0
Lubricate chassis components (or every 3 months, whichever occurs first).
0
Check readfront axle fluid level and add fluid as needed. Check constant
Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper
An Emission Control Service.
(See footnote
#.)
velocity joints and axle seals for leaking. (See footnote
**.)
rotation pattern and additional information. (See footnote
+.)
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DATE
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MILEAGE
DATE
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7-9