Castrol 4-Life Advanced Engine Coolant, 1 L for classic cars (1945âÂÂ1985). Ready to use, does not dilute; non-flammable, anti-foam, pH balanced. Up to 10 years protection or frost to -42ðC. Protects cast iron, brass and aluminium. Liquid Litmus indicator signals head gasket issues. Do not mix with other coolants.