GMC Chevrolet SSR 2003 Owner's Manual page 336

90,000 Miles (150 000 km)
Change automatic transmission fluid and filter if the
vehicle is mainly driven under one or more of these
conditions:
− 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.
Check rear axle fluid level and add fluid as needed.
Replace fuel filter. An Emission Control Service.
(See Footnote †.)
Replace engine air cleaner filter. See Engine Air
Cleaner/Filter on page 5-20 for more information.
An Emission Control Service.
6-8
97,500 Miles (162 500 km)
Check rear axle fluid level and add fluid as needed.
100,000 Miles (166 000 km)
Inspect spark plug wires. An Emission Control
Service.
Replace spark plugs. An Emission Control Service.
150,000 Miles (240 000 km)
Drain, flush and refill cooling system (or every
60 months since last service, whichever occurs first).
See Engine Coolant on page 5-24 for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test the cooling system
and pressure cap. An Emission Control Service.
Inspect engine accessory drive belt. An Emission
Control Service.