What Kind Of Engine Oil To Use - GMC 2006 DURAMAX Manual

Be sure to add enough oil to put the level somewhere
in the proper operating range. Push the dipstick all the
way back in when you are through.
5-22
See Engine Compartment
Overview on page 5-18 for
the location of the engine
oil fill cap.

What Kind of Engine Oil to Use

Look for these two things:
•
CI-4 or CH-4
Oils designated as API CI-4 or CH-4 are
recommended for your vehicle. The CI-4 or CH-4
designations may appear either alone, together, or
in combination with other API designations, such
as API CI-4/SL.
These letters show American Petroleum
Institute (API) levels of quality.
Notice: Use only engine oils that have one of these
designations CI-4 or CH-4 for the DURAMAX
engine. Failure to use the recommended oils can
result in engine damage not covered by your
warranty.
®
diesel