Maintenance Specifications
PACCAR
Y53-1030A 12/09
– 65 –
durability by maintaining lubrication during high temperature
operating conditions. Since multigrade oils have been shown
to provide approximately 30 percent lower oil consumption
compared with monograde oils, it is important to use multi-
grade oils to be certain the engine will meet applicable emis-
sions requirements.
Use of "synthetic engine oils" (those made with API group 3
or group 4 base stocks) is permitted subject to the same per-
formance and viscosity limitations of petroleum (mineral)
based engine oils. The same oil change intervals must be
applied to synthetic oils that are applied to petroleum (min-
eral) based engine oils.
While the preferred viscosity grade is 15W-40, lower viscosity
multigrade oils can be used in colder climates. See the
accompanying chart. Any viscosity grade lower than 15W-40
must still meet CES 20081.
Synthetic engine oils, API Group III and Group IV base-
stocks, are recommended for use in PACCAR engines oper-
ating in ambient temperature conditions consistently below -
25°C [-13°F]. Synthetic 0W-30 oils that meet the require-
ments of API Group III or Group IV basestocks, can be used
in operations where the ambient temperature never exceeds
0°C [32°F]. Multiviscosity oils rated 0W-30 do not offer the
same level of protection against fuel dilution as do higher
multigrade oils. Higher cylinder wear can be experienced
when using 0W-30 oils in high-load situations.
As these oils have directionally thinner oil films than 15W-40
oils, top-quality Fleetguard® filters must be used above 20°C
[70°F]. Some oil suppliers might claim better fuel economy
for these oils. PACCAR can neither approve nor disapprove
any product not manufactured by PACCAR. These claims
are between the customer and oil supplier. Obtain a commit-
ment from the oil supplier that the oil will give satisfactory
performance in PACCAR engines or do not use the oil.
New Engine Break-In Oils
Special “break-in” engine lubricating oils are not recom-
mended for new or rebuilt PACCAR engines. Use the same
lubricating oil that will be used during normal operation.
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