Manual Description
These instructions apply only when the coolant temperature stays in the normal range. When the ignition is switched on, several warning and indicator lights come on briefly for a function check. It also helps to protect the light alloy parts in the engine cooling system against corrosion.
In addition, the mixture helps prevent calcium deposits and increases the boiling point of the engine coolant. To protect the engine, the mixture must always contain at least 40% coolant additive even in warm weather or climates where antifreeze protection is not needed. If more antifreeze protection is needed for climate conditions, the percentage of coolant additive can be increased.
However, the coolant additive percentage must never be more than 60%; otherwise, antifreeze protection is reduced and the ability of the mixture to cool the engine is also reduced. The heater would also not work, and vehicle occupants could be without protection at subfreezing temperatures. Mixing Volkswagen coolant additives with coolant additives made by other manufacturers can seriously damage the engine and the engine cooling system.
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General