Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336148) - 2020 - CRC - 9/5/19
22
Driving and Operating
Fill the DEF tank on level ground
and with the vehicle off. When
adding DEF, it is recommended to
fully fill the DEF tank. For DEF tank
capacity see
. When adding
DEF to an empty or very low tank,
always add at least 7.5L (2 gal) of
fluid to release the vehicle from
speed limitation.
If DEF is added under freezing
conditions it may require less fluid to
fill the DEF tank.
When fluid reaches the top of the
DEF fill pipe, stop filling. Do not top
off the DEF tank. If using a bottle or
jug to refill DEF, follow the
instructions on the container label
and use a dedicated fill aid.
Caution
Do not overfill the DEF tank and
do not allow DEF to contact the
finished surfaces of the vehicle,
as it could damage the vehicle
finish. If DEF is spilled during
filling, wipe any affected surface
with a damp cloth.
When replacing the DEF cap, turn it
clockwise until it clicks. Make sure
the cap is fully installed.
Push the fuel/DEF door closed.