Use of diesel fuel other than Ultra Low Sulfur Diesel (15 ppm sulfur maximum) or engine
oil other than low ash CJ-4 oil will cause permanent damage to the DPF and related
components.
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 the temperature stays below
−18°C (0°F). However, the fuel will produce a power and fuel economy loss. The use of Number
1-D diesel fuel in warm or hot climates may result in stalling, poor starting when the engine is hot
and may damage the fuel injection system.
It is acceptable to use diesel fuel containing up to 20 percent biodiesel (B20), but the final blended
fuel must meet the same specification, ASTM D 975 (Grades No. 2-D or No. 1-D S15 commonly
known as Ultra Low Sulfur diesel), as the other fuels used in your vehicle, and the biodiesel used
for making this fuel must meet the latest version of ASTM specification D 6751. Biodiesel is
produced from vegetable oils or animal fat that have been chemically modified to reduce the
possibility of damage to the fuel system and engine. Higher concentration (i.e. greater than B20)
biodiesel-containing fuels or the use of unmodified bio-oils blended into diesel fuel at any
concentration is not recommended and could damage the fuel system and engine. Such damage
would not be covered by your warranty. If there are questions about the biodiesel-containing fuels
you are using, contact your fuel supplier.
Because of the cleansing properties of biodiesel, switching from straight diesel to a biodiesel blend
can prematurely restrict the fuel filter with normal deposits in the fuel system. A fuel filter
replacement might be required sooner than the recommended interval.
Diesel fuel may foam when filling the tank. This can cause the automatic pump nozzle to shut OFF,
even though the tank is not full. If this happens, just wait for the foaming to stop and then
continue to fill the tank.
What Fuel to Use in Canada
Canadian fuels are blended for seasonal changes. Diesel Type A fuel is blended for better cold
weather starting, when it stays below −18°C (0°F). However, the fuel will produce a power and
fuel economy loss. The use of Type A diesel fuel in warmer climates may result in stalling, poor
starting. Diesel Type B fuel is blended for temperatures above −18°C (0°F). The emission control
system requires the use of diesel fuel with ultra low sulfur, 15 ppm (maximum), content. Both low
and higher sulfur fuels will be available in Canada. Only ultra low sulfur diesel fuels are available
in the United States. Diesel-powered trucks must be refueled with ultra low sulfur fuel only. Use of
fuels with higher-sulfur content will affect the function of the emission components and may cause
reduced performance, excessive smoke and unpleasant odor.
It is acceptable to use diesel fuel containing up to 20 percent biodiesel (B20), but the final blended
fuel must meet the same specification, CAN/CGSB-3.517 (ULS) in Canada, as other fuels used in
your vehicle, and the biodiesel used for making this fuel must meet the latest version of ASTM
specification D 6751. Biodiesel is produced from vegetable oils or animal fat that have been
chemically modified to reduce the possibility of damage to the fuel system and engine. Higher
concentration (i.e. greater than B20) biodiesel-containing fuels or the use of unmodified bio-oils
blended into diesel fuel at any concentration is not recommended and could damage the fuel
system and engine. Such damage would not be covered by your warranty. If there are questions
about the biodiesel-containing fuels you are using, contact your fuel supplier.
Very Cold Weather Operation
If the vehicle is driven in very cold temperatures and cannot get a winterized Number 2-D that
has been adapted to cold weather or a Number 1-D, use one gallon of kerosene for every 2
gallons of diesel fuel. Once you add kerosene, run the engine for several minutes to mix the fuels.
Only add kerosene when the temperature falls below −18°C (0°F), because the fuel economy and
lubricating qualities of kerosene is not as good as that of diesel fuel.
In cold weather , the fuel filter may become clogged (waxed). To unclog the filter, move the
vehicle to a warm garage area and warm the filter to a temperature between 0–10°C (32–50°F).
Replacing the filter is not necessary.
Fuel Specific Gravity Testing
Use a J 38641-B Diesel Fuel Quality Tester to measure the fuel specific gravity (API Rating).
Follow the instructions on the tool to obtain the proper temperature-adjusted value. This
information must be accurate for the proper diagnosis of the fuel system.
Water in Fuel
Sometimes, water can be found in the fuel tank along with diesel fuel. This can happen if the
service station does not regularly inspect and clean their fuel storage tanks, or the fuel is
contaminated as received from the service stations suppliers.
If water is detected by the Water in Fuel Sensor, a Water-In-Fuel light will illuminate. If the Water-
In-Fuel light illuminates, the water must be drained from the fuel system on the vehicle.