Pontiac 1998 Trans Sport Owner's Manual page 412

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Short Trip/City Maintenance Schedule
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50,000 Miles (83 000 km)
0
Change automatic transaxle fluid and filter if the vehicle is mainly driven
under one or more of these conditions:
MILEAGE
-
In heavy city traffic where the outside temperature regularly reaches 90°F
(32" C) or higher.
- In hilly or mountainous terrain.
-
When doing frequent trailer towing.
- Uses such as found in taxi, police or delivery service.
r y o u
do not use your vehicle under any of these conditions, the fluid and
filter do not require changing.
51,000 Miles (85 000
km)
El Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
54,000 Miles (90 000 km)
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Sewice.
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I
I
17
Lubricate chassis components (or every 6 months, whichever occurs first).
0
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
( S e e footnote
#.)
rotation pattern and additional information. (See footnote +.)
7-13