Chevrolet 1998 C/K Full-Size Pickup Owner's Manual page 318

How to Check Lubricant What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant to use. See "Recawended Fluids and
Lubricants'' in the Index.
If the level is below the bottom of the filler plug hole,
you may need
to
add some lubricant.
When the differential is cold, add enough lubricant to
raise the level to 1/2 inch (12 mm) below the filler
plug hole.
When the differential is at operating temperature
(warm), add enough lubricant to raise the level to the
bottom of the filler plug hole.
Engine Coolant
The cooling s stem in your vehicle is filled with
DEX-COOL engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240
000 km), whichever occurs first, if you add only
DEX-COOL@ extended life coolant.
J
The following explains your cooling system and how
to add coolant when it is low. If
you
have a problem
with engine overheating, see "Engine Overheating" in
the Index.
A 50/50 mixture of water and DEX-COOL@ coolant will:
Give freezing protection down to -34°F (-37°C).
0
Give boiling protection up to 265 "F (129°C).
Protect against rust and corrosion.
0
Help keep the proper engine temperature.
Let the warning gages work as they should.
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