Maintenance Specifications
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Y53-1030A 12/09 PACCAR
Cooling System Sealing Additives
CAUTION: The use of sealing additives in the
cooling system will cause damage to the engine.
Sealing additives will plug various areas of the
radiators and oil cooler. The plugging of the
cooling system will hamper heat transfer thus,
causing internal engine damage. Do not use
sealing additives in the cooling system. The use
of sealing additives will:
• Buildup in coolant low-flow areas
• Plug the radiator and oil cooler
• Possibly damage the water pump seal.
Failure to comply may result in equipment or
property damage.
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