WARNING
The use of diesel fuel that has been mixed with other fuels may cause an explosion. DO NOT mix gasoline, alcohol, or gasohol with
diesel fuel. Make sure you know your fuel source and use the recommended diesel fuel as indicated in this section of the manual.
Failure to comply may result in death, personal injury, equipment or property damage.
CAUTION
Dirt or water in the fuel system can cause severe damage to both the fuel pump and the fuel injectors. Due to the precise tolerances
of diesel injection systems, it is extremely important that the fuel be kept clean and free of dirt or water. Know your fuel source and
make sure all steps are taken for dispensing or using clean fuel in your vehicle. Failure to comply may result in equipment or property
damage.
CAUTION
Unapproved fuel can reduce economy or possibly damage fuel system components. Unapproved fuels typically do not have enough
lubricity elements in the fuel to properly lubricate the fuel injection system. Be sure you follow the fuel recommendations as indicated
in this section of the manual. Failure to comply may result in equipment or property damage.
CAUTION
Using diesel fuels blended with lubricants may cause damage to your engine aftertreatment system. Service intervals for engine af-
tertreatment systems will be reduced. DO NOT use diesel fuel blended with lubricating oil in engines equipped with an engine after-
treatment system. Failure to comply may result in equipment or property damage.
CAUTION
DO NOT use high-sulfur diesel fuel as it will damage the exhaust aftertreatment system. Also, the engine will not meet emission
regulations. Use only ultra-low-sulfur diesel (ULSD) fuel. Failure to comply may result in equipment or property damage.
CAUTION
If ultra-low-sulfur diesel (ULSD) fuel is not used, the engine may not meet emission regulations, and damage may occur to the en-
gine aftertreatment system. The use of high-sulfur diesel fuel will damage the engine aftertreatment system and impact the engine
emission. ULSD fuel is required for correct operation of the aftertreatment. The engine has been optimized for use with an engine
aftertreatment system together with ULSD fuel to meet the 2013 U.S. Environmental Protection Agency regulations. Failure to com-
ply may result in equipment or property damage.
NOTE
PACCAR recommends that the cetane number of diesel fuel be a minimum of 45 for engines that are expected to operate at temper-
atures below 32ºF (0ºC) and a minimum of 42 for engines that are operated at temperatures above 32ºF (0ºC).
Using diesel fuel with a lower-than-recommended cetane number can cause hard starting instability, and excessive white
smoke. To maintain satisfactory operation at low ambient temperatures, it is important to specify diesel fuel of the correct
cetane number.
PACCAR requires all permissible fuels to have adequate fuel lubricity. Lubricity can be determined by ASTM, specification
D6079, ISO 12156, High Frequency Reciprocating Rig (HFRR) in which the fuel must have a wear scar diameter of 0.02
in. (0.5 mm) or less.
The use of Ultra-low-sulfur diesel (ULSD) fuel is required for this engine in order to meet emission regulations and to
prevent damage to the engine and exhaust system. The use of other grades of diesel fuels other than ULSD fuel will be
considered a use of incorrect fuel for the engine. PACCAR is not responsible for failures caused by the use of incorrect
fuel, oil or DEF or by water, dirt or other contaminants in the fuel or DEF.
CHAPTER 3: FUEL RECOMMENDATIONS -
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SM044-004 (01/2021)
