GMC 2018 Acadia Denali Owner's Manual page 333

332 Service and Maintenance
Check drive and accessory belts
(power steering, AC compressor,
alternator). Check condition and
check length as shown on length
indicators.
Visually inspect gas strut for
signs of wear, cracks, or other
damage. Check the hold open
ability of the strut. If the hold
open ability is low, service the
gas strut. See Gas Strut(s)
0 279.
Inspect sunroof track and seal,
if equipped. See Sunroof 0 49.
Additional Required Services
Normal Service
Every 20 000 km/12,500 mi
Replace engine air cleaner filter.
Or every 12 months, whichever
comes first. If driving in dusty
conditions, inspect the filter at
each oil change or more often as
needed.
Replace passenger
compartment air filter,
if equipped. Or every two years,
whichever comes first. More
frequent replacement may be
needed if the vehicle is driven in
areas with heavy traffic, areas
with poor air quality, or areas
with high dust levels.
Replacement may also be
needed if there is a reduction in
air flow, excessive window
fogging, or odors.
Every 60 000 km/38,000 mi
Change transfer case fluid,
if equipped with AWD. Do not
directly power wash the transfer
case output seals. High pressure
water can overcome the seals
and contaminate the transfer
case fluid. Contaminated fluid
will decrease the life of the
transfer case and should be
replaced.
Every 70 000 km/43,500 mi
Inspect evaporative control
system. Visually check all fuel
and vapor lines and hoses for
proper attachment, connection,
routing, and condition.
Every 150 000 km/94,000 mi
Replace spark plugs. Inspect
spark plug wires.
Every 240 000 km/150,000 mi
Drain and fill engine cooling
system. Or every five years,
whichever comes first. See
Cooling System 0 268.
Visually inspect accessory drive
belts. Or every 10 years,
whichever comes first. Inspect
for fraying, excessive cracking,
or damage; replace, if needed.
Severe Conditions Requiring
More Frequent Maintenance*
Public service, military,
or commercial use vehicles to
include the following:
Ambulances, police cars and
emergency rescue vehicles.
Civilian vehicles such as light
duty pick-up trucks, SUVs and
passenger cars that are used
in military applications.
Recovery vehicles such as
tow trucks and flatbed single
vehicle carriers or any vehicle
that is consistently used in
towing trailers or other loads.