They are most commonly used in the engine’s cooling system to address pinhole leaks in the radiator, heater core, or hoses Versions are also available for the oil system, though these operate using a different principle to repair leaks around seals and gaskets. Or will they cause more harm than good If only we had a way to find out. Oil stop leak products contain plasticizers, which are able to enter rubber seals and gaskets, making them larger and more flexible.
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