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Is stop leak bad for your car?

Updated: 12/11/2022
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13y ago

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No, it is not bad for your car; most stop leak also includes anti rusting or lubricating agents; but it is also not designed to be a permanent fix. If you need stop leak for either your coolant or oil system, there is obviously some other problem that needs attention, (gaskets/seals) and really should be taken care of within a few months time, even if the stop leak cures the problem. In some cases, the size of the original leak may have a lot to do with the course of action on the repair. In coolant systems, a small leak MIGHT be repaired permanently with a stop leak that contains what looks like tiny balls of solder.

Yes, it can be. Radiator stop leak can plug the passages in the radiator, heater core, or engine block.

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