STP radiator flush 300ml can efficiently clean the cooling system. Its contain advanced formula clears blocked water channels that can cause overheating. This product can be used before changing or adding coolant/anti-freeze, to help keep your cooling system in optimum operating condition. It is safe with all metals. Shake bottle well and pour entire bottle into radiator. Leave in the cooling system and drive for about 30 minutes. Drain the radiator when cold, flush and refill with appropriate coolant/anti-freeze per manufacturer instructions. On vehicles where heater cannot be drained (see handbook), run the engine with the heater on, until the engine has warmed up, then drain the system and flush with clean water before adding anti-freeze.

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