Do stop leak additives work to seal engine leaks?

0 votes
asked Jul 30, 2020 in Repairs/Maintenance by PKAkatora (280 points)
Do stop leak additives work to seal engine leaks?

1 Answer

0 votes
answered Jul 31, 2020 by Mechanic21 (29,150 points)
Yes stop leak additives do work to seal some engine leaks.

However it depends on the size of the engine leak and where the leak is occurring.

If you have an engine rear seal leaking then the oil leak additive will slow down and stop the leak temporarily until you can replace the engine seal.

The leak additives work by swelling out the oil seal and bringing the oil seal back to life and the oil stop leak additives are meant as a temporary fix.

I've had good luck with the oil stop leak additives for temporary fixes.

Just like I've had good luck with the head gasket sealers in a bottle for temporary fixes.

However to permanently fix an head gasket leak or an oil leak you need to actually replace the seals or head gaskets.

98,443 questions

94,802 answers

1,270 comments

6,992,772 users

...