Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-16504481) - 2023 - CRC - 9/26/22
24 Driving and Operating
reduce power and fuel economy. Avoid
using severe winter grade fuel in warm or
hot climates. It can result in stalling, poor
starting, and damage to the fuel injection
system.
Fuels improperly blended for cold
temperature operation may result in
restricted fuel filters. The vehicle is equipped
with a fuel heating system to prevent
gelling or waxing of conventional diesel fuel
and biodiesel blends, but may not prevent
all cases.
In case of severe winter conditions, the fuel
filter may become clogged by wax naturally
present in the fuel. To unclog it, move the
vehicle to a warm garage area and allow the
filter to warm up. The fuel filter may need
to be replaced. See Fuel Filter Replacement
0 27.
Biodiesel
Biodiesel is a renewable fuel produced from
vegetable oils or animal fats that have been
chemically modified to make it compatible
with diesel fuel.
Caution
Do not use home-made biodiesel or home
test kits because the quality cannot be
verified by approved scientific methods.
Do not use raw vegetable oil or other
unmodified bio-oils, fats, or blends of
vegetable oil with diesel. They could
damage the fuel system and engine, and
damages would not be covered by the
vehicle warranty.
Biodiesel Blends
Fuels with a biodiesel content up to 20% by
volume may be used (e.g., named B20).
Only use biodiesel blends up to 20% by
volume that comply with your country’s or
region’s fuel standards.
Caution
Do not use blends containing more than
20% biodiesel. Any engine, fuel system,
or exhaust after-treatment system
damage would not be covered by the
vehicle warranty.
As a renewable fuel, biodiesel provides some
environmental benefits. However, biodiesel
has unique properties and needs to be
handled differently than diesel fuel. Its use
presents additional risks and may not be
appropriate in all situations. Certain vehicle
operating modes increase these risks and
should be avoided.
Biodiesel fuel quality degrades with time
and exposure to high temperature quicker
than Ultra Low Sulfur Diesel fuel. More
frequent refueling provides the best
opportunity to have a supply of fresh fuel.
Storage at hot ambient temperatures will
accelerate biodiesel degradation.
If the vehicle is not driven often and uses
little fuel, or if it is stored for extended
periods of time, avoid the use of biodiesel
blended fuels above 5% by volume. When
the vehicle is stored for longer than one
month, it should be run out of biodiesel to
below one-quarter tank, refueled with
biodiesel-free fuel, and driven several
kilometers (miles) before storage.
Cold Weather Operation
In cold weather, the fuel filter may become
clogged by wax naturally present in the
fuel. To unclog it, move the vehicle to a
warm garage area and allow the filter to
warm up. The fuel filter may need to be
replaced. See Fuel Filter Replacement 0 27.
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