Chevrolet Silverado 4500HD/5500HD/6500HD Owner Manual (GMNA-
Localizing-U.S.-12102101) - 2019 - crc - 10/2/18
Vehicle Care
297
American Petroleum Institute (API)
Symbol
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.
Look for this on the oil container,
and use only those oils that display
this logo.
Caution
Use only engine oils that have the
designation CJ-4 or CK-4 for the
diesel engine. Failure to use the
recommended oil can damage the
DPF and result in engine damage
not covered by the vehicle
warranty.
Viscosity Grade
Use SAE 15W-40 viscosity grade
engine oil.
When it is very cold, below
−
18 °C
(0 °F), use SAE 5W-40 to improve
cold starting. These numbers on the
oil container show its viscosity,
or thickness.