Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
66 Vehicle Care
containing used engine oil. See the
manufacturer's warnings about the
use and disposal of oil products.
Used oil can be a threat to the
environment. If you change your
own oil, be sure to drain all the oil
from the filter before disposal. Never
dispose of oil by putting it in the
trash or pouring it on the ground,
into sewers, or into streams or
bodies of water. Recycle it by taking
it to a place that collects used oil.
Engine Oil Life System
The engine oil life system calculates
engine oil life based on vehicle use
and displays the CHANGE ENGINE
OIL SOON message when it is time
to change the engine oil and filter.
The oil life system should be reset
to 100% only following an oil
change. See “Engine Oil Life
System” in the owner’s manual.
Automatic Transmission
Fluid
When to Check and Change
Automatic Transmission Fluid
It is usually not necessary to check
the transmission fluid level. The only
reason for fluid loss is a
transmission leak or overheated
transmission. This vehicle is not
equipped with a transmission fluid
level dipstick. There is a special
procedure for checking and
changing the transmission fluid in
these vehicles. Because this
procedure is difficult, this should be
done at your dealer. Contact your
dealer for additional information or
refer to the service manual for the
procedure.
Caution
Use of the incorrect automatic
transmission fluid may damage
the vehicle, and the damage may
not be covered by the vehicle
(Continued)
Caution (Continued)
warranty. Always use the correct
automatic transmission fluid. See
Recommended Fluids and
Lubricants 0 85.
Change the fluid and filter at
the scheduled maintenance
intervals listed in Maintenance
Schedule 0 81. Be sure to use the
transmission fluid listed in
Recommended Fluids and
Lubricants 0 85.
Engine Air Filter Life
System
If equipped, this feature provides
the engine air filter’s remaining life
and best timing for a change. The
timing to change an engine air filter
depends on driving and
environmental conditions.
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