420SEL (126.035) V8-4.2L (116.965) (1986)
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Coolant: Service and Repair
AH20.00-N-2080-01A Notes on coolant
Coolant composition
passenger car and commercial vehicle engines (normally)
50 water in % by volume and
50 corrosion/antifreeze agent in % by volume.
Observe different coolant composition for CV engines.
Tasks of corrosion and frost protection
^
Corrosion and cavitation protection of all components in cooling system
^
Antifreeze protection (frost protection)
^
Increase the boiling point so that coolant does not evaporate so rapidly. Avoiding ejection of coolant at high coolant temperatures.
Antifreeze protection
50% by volume of anticorrosion/ antifreeze agent offers antifreeze protection down to approx. -37°C A higher concentration is only necessary if the
ambient temperatures are even lower. 55 % by volume of anticorrosion/antifreeze agent offers antifreeze protection down to approx. -45°C.
A concentration of more than 55 % by volume of anticorrosion/ antifreeze agent should not be used as the maximum antifreeze protection is already
reached. An even higher concentration once reduces antifreeze protection and impairs heat dissipation. Reduced heat dissipation can lead to damage to
components in the cooling system or damage to the engine.
Water
Use water which is clean and not too hard. Drinking water often satisfies requirements, but not always the contents of dissolved substances in the
water may be of significance for the occurrence of corrosion. If in doubt, analyze the water.
Period of use
The maximum permissible period of use of the coolant can be taken from the maintenance booklet.
Before pouring in fresh coolant, flush the used coolant out of the cooling system. In the event of high pollution or oil fouling levels, clean the cooling
system, otherwise damage can occur to the components of the cooling system.
Disposing of coolants
Pay attention to legal provisions and local wastewater regulations.