GMC T-Series 1999 Owner's Manual page 208

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NOTICE:
Don't add too much oil. If your engine has so
much oil that the oil level gets above the proper
operating range, your engine could be damaged.
Be sure to fill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you're through.
What Kind of Engine Oil to Use
Look for these two things:
D
-
CG
4
Oils designated as API CG
-
vehicle. The CG
4 designation may appear either
alone, or in combination with other API
designations, such as API CG
-
-
SH/CG
4 or SJ/CG
4.
These letters show American Petroleum Institute
(API) levels of quality.
6-22
-
4 are best for your
-
-
4/SH, CG
4/SJ,
NOTICE:
If you use oils that don't have one of these
designations, you can cause engine damage which
is not covered by your warranty.
D
-
SAE 15W
40
As shown in the viscosity chart, SAE 15W
for your vehicle. However, you can use SAE
-
10W
30 if it's going to be colder than 32
before your next oil change. When it's very cold,
_
_
-
below 0
F (
18
C), you should use SAE 10W
improve cold starting. Also, SAE 30 may be used at
temperatures above freezing, 32
These numbers on the oil container show its
viscosity, or thickness. Do not use other viscosity
oils such as SAE 10W
-
40 is best
_
_
F (0
C)
-
30 to
_
_
F (0
C).
-
-
40 or SAE 20W
50.
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