GMC 1997 Suburban Owner's Manual page 398

100,000 Miles (1 66 000 km) (Continued)
-
In hilly or mountainous terrain.
-
When doing frequent trailer towing.
-
Uses such as found in taxi, police or
delivery service.
VJYIU
do
rmt
use your vehicle urder
c l n ~ '
o f
these
conditions, the.fluici crndfilter do n.ot require chcrnging.
Inspect Positive Crankcase Ventilation (PCV)
valve.
An Emission Control Service.
DATE SERVICED B Y ACTUAL MILEAGE
150,000 Miles (240 000 km)
0
Drain? flush and refill cooling system
(or every 60 months since last service,
whichever occurs first). See "Engine
Coolant" in the Index 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.
DATE SERVICED B Y ACTUAL MILEAGE