GMC 1999 Suburban, Owner'S Manual, Page: 377 / 424

Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
yellow blue
7-27
The services shown in this schedule up to 100,000 miles
(166 000 km) should be performed after 100,000 miles
(166 000 km) at the same intervals. The services shown
at 150,000 miles (240 000 km) should be performed at
the same interval after 150,000 miles (240 000 km).
See “Owner Checks and Services” and “Periodic
Maintenance Inspections” following.
Footnotes
[ The U.S. Environmental Protection Agency or the
California Air Resources Board has determined that the
failure to perform this maintenance item will not nullify
the emission warranty or limit recall liability prior to the
completion of the vehicle’s useful life. We, however,
urge that all recommended maintenance services be
performed at the indicated intervals and the maintenance
be recorded.
# Lubricate the front suspension, kingpin bushings,
steering linkage, transmission shift linkage, transfer case
shift linkage, parking brake cable guides, front axle
propshaft spline and brake pedal springs. Ball joints and
kingpin bushings should not be lubricated unless their
temperature is 10
_F (
-
12
_C) or higher, or they could
be damaged.
+ A good time to check your brakes is during tire
rotation. See “Brake System Inspection” under “Periodic
Maintenance Inspections” in Part C of this schedule.
** Drive axle service (see “Recommended Fluids and
Lubricants” in the Index for proper lubricant to use):
D Locking Differential
--
Drain fluid and refill at first
engine oil change. At subsequent oil changes, check
fluid level and add fluid as needed.
D Standard Differential
--
Check fluid level and add
fluid as needed at every engine oil change.