•SAE 15W-40
As shown in the viscosity chart, SAE 15W-40
is best for your vehicle. However, you can
use SAE 10W-30 at temperatures above 0°F
(−18°C). When it is very cold, below 0°F
(−18°C), you should use SAE 5W-40 to
improve cold starting. 5W-40 is not
recommended for use at high temperatures,
above 100°F (38°C).
These numbers on the oil container show its
viscosity, or thickness. Do not use other
viscosity oils such as SAE 10W-40 or
SAE 20W-50.
This doughnut-shaped
logo (symbol) is used on
most oil containers to
help you select the
correct oil. It means that
the oil has been certified
by the American
Petroleum Institute.
You should look for this on the oil container, and
use only those oils that display this logo.
275
Part C: Recommended Fluids
and Lubricants
Fluids and lubricants identified below by name,
part number, or specification may be obtained
from your dealer.
Usage Fluid/Lubricant
Engine Oil
(Gasoline
Engine)Engine oil which meets GM
Standard GM6094M and displays
the American Petroleum Institute
Certified for Gasoline Engines
starburst symbol. GM Goodwrench
®
oil meets all the requirements for
your vehicle. To determine the
proper viscosity for your vehicle’s
engine, see “Engine Oil” in the
Index.
Usage Fluid/Lubricant
Engine Oil
(DURAMAX
®/
Isuzu Diesel
Engines)Engine oil with the letters CJ-4
or CI-4 is best for your vehicle.
The CJ-4 or CI-4 designation
may appear either alone or in
combination with other API
designations, such as API CJ-4/SM.
These letters show American
Petroleum Institute levels of quality.
To determine the preferred viscosity
for your vehicle’s diesel engine,
see “Engine Oil” in the Index.
Engine Oil
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine
oil recommendations.
Engine Coolant
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine
coolant recommendations.
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