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 dis-
pensing or using clean fuel in your ve-
hicle. Failure to comply may result in
equipment or property damage.
CAUTION
Unapproved fuel can reduce economy
or possibly damage fuel system com-
ponents. 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 lubri-
cants may cause damage to your en-
gine aftertreatment system. Service in-
tervals for engine aftertreatment sys-
tems will be reduced. DO NOT use
diesel fuel blended with lubricating oil
in engines equipped with an engine af-
tertreatment 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 aftertreat-
ment system. Also, the engine will not
meet emission regulations. Use only
ultra-low-sulfur diesel (ULSD) fuel.
Failure to comply may result in equip-
ment 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 engine aftertreatment
system. The use of high-sulfur diesel
fuel will damage the engine aftertreat-
ment 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 sys-
tem together with ULSD fuel to meet
the 2013 U.S. Environmental Protec-
tion Agency regulations. Failure to
comply 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 op-
erate at temperatures 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
ENGINE MAINTENANCE - Fuel Recommendations
64 Y53-1166-1M1 (10/2020)
2
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