Extended Life Coolant
Perform these maintenance procedures
according to the Preventative Maintenance
Schedule.
•
Conduct coolant maintenance
checks including freeze point, pH,
nitrite and carboxylate tests at least
twice annually to maintain engine
protection.
Nitrited Extended Life Coolant
For nitrited formulations (NOAT), a heavy-
duty extended life coolant that meets
ASTM D6210 and Caterpillar EC-1
specifications must be used.
Unless otherwise optioned, factory fill
coolant is an ethylene glycol, nitrited
organic acid technology (NOAT) extended
life coolant (ELC) formulation at a 50:50
coolant-to-distilled water mixture. The
factory fill exceeds ASTM D6210 and
Caterpillar EC-1 requirements. Maintaining
coolant chemistry and freeze protection is
critical to engine and cooling system
component health and longevity.
The change interval for extended-life
coolant containing nitrite and molybdate is
750,000 miles (1,200,000 km) or 12,000
hours of on-road use (8 years or 15,000
hours of off-highway use) on initial fill with
no extender added. The change interval is
1,000,000 miles (1,600,000 km)/20,000
hours/8 years with an extender addition at
500,000 miles (800,000 km)/10,000
hours/4 years.
Nitrite-Free Extended Life Coolant
Nitrite-free organic acid technology coolant
(OAT) may be used if it meets DAF 74002.
The change interval for nitrite free coolant
is 600,000 miles (1,000,000 km) or 6
years, with no extender needed. DO NOT
add coolant extender to nitrite-free coolant.
Follow the coolant supplier's drain/flush/fill/
diluting percentages when servicing a
vehicle filled with nitrite-free coolant.
Additional Recommendations:
•
Antifreeze is essential for freeze,
overheat, and corrosion protection.
The use of supplemental coolant
additives (SCAs) is not
recommended for extended-life
coolants.
Recommended Extended Life
Coolant Suppliers
Authorized PACCAR Engine dealer
®
Fuel Recommendations
WARNING
The use of diesel fuel that has been
mixed with other fuels may cause an
explosion. DO NOT mix gasoline, alco-
hol, 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.
ENGINE MAINTENANCE - Extended Life Coolant
Y53-1166-1M1 (10/2020)
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