Pontiac 1999 Sunfire Owner's Manual page 310

Short Trip/City Scheduled Maintenance
50,000 Miles (83 000 km) (Continued)
– When doing frequent trailer towing.
– Uses such as found in taxi, police or delivery service.
If you do not use your vehicle under any of these conditions, the fluid and
filter do not require changing.
Manual transaxle fluid doesn't require change.
51,000 Miles (85 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
54,000 Miles (90 000 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 +.)
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