Pontiac 1999 Montana Owner's Manual page 381

Short Trip/City Scheduled Maintenance
3,000 Miles (5 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
6,000 Miles (10 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
j
Lubricate chassis components (or every 6 months, whichever occurs first).
(See footnote #.)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
9,000 Miles (15 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
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