operators_manual

CAUTION
When adding coolant, avoid mixing dif-
ferent
brands and formulations. If the
coolant is mixed with more than 25%
of a different formulation (for example,
mixing OAT and NOAT coolants), en-
gine corrosion damage could occur. If
mixing exceeds 25% of total system
volume, it is recommended to flush
and refill the system completely with
one type of coolant.
Coolant Filter
Your engine is equipped with a coolant
filter designed to capture and remove
harmful deposits from the cooling system
to help prolong system life. It is a "blank
filter" and does not contain chemicals or
time-release additives. Replace it only with
a blank filter at the interval specified in the
Preventative Maintenance Schedule.
NEVER use filters that contain
supplemental coolant additives (SCAs) in
an ELC-filled system.
CAUTION
Use of non-genuine PACCAR coolant
filters
may cause severe engine dam-
age.
Cooling System Sealing Additives
and Soluble Oils
OK
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1. Do not use soluble oils or sealing
additives.
CAUTION
The use of sealing additives or soluble
oils in the cooling system can cause
damage to the engine. These additives
can plug various areas of the radiator,
EGR system and oil cooler. The plug-
ging of the cooling system can hamper
heat transfer, causing internal engine
damage.
DO NOT use sealing addi-
tives or soluble oils in the cooling sys-
tem. The use of sealing additives can:
• Build up in coolant low-flow
areas
• Plug the radiator and oil cooler
• Damage the water pump seal
• Damage heat transfer surfaces
• Damage seals and hoses
• Corrode brass and copper
Failure to comply may result in equip-
ment or property damage.
MAINTENANCE - Cooling System Maintenance
200 Y53-6096-1C1 (09/20)
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