The coolant must be replaced after any work has been carried out on the elements of the cooling system with the coolant drained. If during the repair the cylinder head, cylinder head gasket, radiator or oil heat exchanger were replaced, it is necessary to fill in only fresh coolant. This is due to the fact that the anti-corrosion additive is deposited during the operation of the coolant and creates an anti-corrosion protection. In used coolant, anti-corrosion additives are not active enough to form a protective layer on newly installed parts.
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