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Stop Leak Additives

Stop leak additives for engines, radiators and rear main seals, including a head gasket repair treatment and engine oil resealers.Stop leak treatments for engines, radiators, seals and head gaskets.
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Choosing a stop leak by system

Engine oil, cooling system and head gasket treatments are made for different systems, so identify where the fluid is being lost before choosing.

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Engine oil or coolant

Some products are intended for the engine oil system, others for the radiator and cooling circuit. Confirm which system the product is made for before buying.

Specific seal or general treatment

Rear main seal and head gasket products target a particular area, while general engine stop leaks are broader. Match the wording to the symptom you have confirmed.

Read the product instructions

Check the label for engine type limits and any warnings. An additive may not suit every engine or leak, so a workshop opinion can help when unsure.

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