Prescribed mixture for coolant

50 % antifreeze for anti-freezing protection down to -38 °C

The original coolant mixture poured into the cooling system at the factory has this antifreeze-to-water ratio.

If the proportion of antifreeze is less than 40 % to -29 °C (i.e. the water content is higher than 60 %), not only the degree of protection against freezing, but also protection against corrosion is reduced. When the water content is too high, this can lead to premature overheating in very hot weather or hot climates and as a consequence lead to coolant being ejected out of the system and damage to the engine through overheating.

This means that it is essential that an anti-freezing and anti-corrosive agent is added even in the tropics.

Too high a concentration, more than 55 % down to -47°C, leads to deterioration of the cooling properties (heat transfer) and protection against freezing-up is modified in the opposite direction, i.e. it also deteriorates.

The amounts of antifreeze required for providing protection against freezing-up are stated as percentage figures on the containers.