Diesel Fuel Requirements and
Fuel System
Some states and provinces have restrictions on the
purchase of diesel fuel for light-duty vehicles and require
you to buy permits or pay special taxes. Some of
these restrictions apply only to residents, and others
apply to both residents and visitors. These restrictions
can change. To learn the current restrictions in any
state or province, contact your auto club, the police or
other officials.
Diesel Engine Fuel
Notice: Diesel fuel or fuel additives not
recommended in this manual could damage your
fuel system and engine. Your warranty would
not cover this damage. And:
•
Diesel fuel that has been mixed with engine oil
or automatic transmission fluid could damage
your engine and emission controls.
•
Aftermarket diesel fuel additives are not tested
by General Motors. Some additives, particularly
those which contain alcohol or water
emulsifiers, may damage your fuel system.
If you believe that unique circumstances call for
a fuel additive to be used, consult your dealer
for advice.
•
If you ever run out of diesel fuel, it can be
difficult to restart your engine. To avoid all this,
never let your tank get empty.
If you run out of fuel, Running Out of Fuel on page 5-9
tells you how to restart your engine.
What Fuel to Use
In the United States, for best results use Number 2-D
diesel fuel year-round (above and below freezing
conditions) as oil companies blend Number 2-D fuel to
address climate differences. Number 1-D diesel fuel
may be used in very cold temperatures (when it stays
below 0°F or
−
18°C); however, it will produce a
power and fuel economy loss. Avoid the use of Number
1-D diesel fuel in warm or hot climates. It may result
in stalling, poor starting when the engine is hot and may
damage the fuel injection system.
At a minimum, the diesel fuel you use should meet
specifications ASTM D975-03 (Grade Low Sulfur) in the
United States. In addition, the Engine Manufacturers
Association (EMA) has identified properties of an
improved diesel fuel for better engine performance and
durability. Diesel fuels corresponding to the EMA
Recommended Guideline on Premium Diesel Fuel
(FQP-1A) could provide better starting, less noise and
better vehicle performance. If there are questions
about the fuel you are using, contact your fuel supplier.
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