Coolant is a toxic fluid. Protect your skin and eyes. Coolant is harmful to the environment; after use, it must be processed as chemical waste.
Coolant is a mixture of antifreeze and water that is used in the cooling system to protect the system from freezing, corrosion, and cavitation.
The cooling system should only be refilled with extended life coolant (ELC) pre-diluted 50/50 with water.
The table below lists the current suppliers that meet the ASTM D6210 standard specification and are allowed to be used in PACCAR engines.
Do not fill the cooling system with coolants other than those specified in this overview.