Lucas Oil 10279 Engine Oil Stop Leak - 1 Gallon

This product works well for non pressurized rubber seals that are dry but not yet broken like valve cover gaskets, vvt solenoid seals, crank seals, cam seals, etc. probably not very effective on pressurized oil seals like oil filter adapter housings. Will absolutely not work on head gaskets because those are metal not rubber so don’t be stupid. I used on a Cadillac North Star I own with many dry rubber seals and it works fantastic and quiets the engine. My car has lots of dry oil seals that I have no interest in fixing all of them and this product is very effective. I use 10 percent approx 10 percent concentration.

I was finding oil beneath my valve covers I believe it was coming from my intake manifold just behind the manifolds. I didn't have the money all the time to change them. I added about a quart and a half and my leaks seem to stop. When you change your oil you have to add it again because you're dumping out the old stuff when you change it. It works pretty good I would recommend it if you can't change those gaskets. If the leaks are too severe nothing will work but changing the gasket so mild leaks this works

I am astounded by this oil additive! I've never been one to use oil or antifreeze additives in the past, however I heard a mechanic talking about this product and I figured what the heck. I have a 2002 GMC Yukon with the typical rear main leak, and I mean LEAK! The engine would leave puddles wherever I went and I would often need to add 1/2 a quart every other week or so. I was quoted approximately $2200.00 to repair the rear main, which is nearly what the vehicle is worth so that was out of the question. So I gave this a try and I am shocked! I have only driven approx 200 miles (I do not drive much and all my driving is in town) so far and I keep checking the oil...and each time I check the stick reads full! I would have needed to add at least 1/2 quart by now! I just cannot say enough about this product and I will certainly recommend Lucas oil stop leak to anyone. I have also noticed my engine sounds better and it doesn't seem to be burning oil anymore as well! The spots under the vehicle have shrunk to just a few drips so I will continue to use with each oil change. Saved me $2200 for sure and my engine has 182,000 miles on it. Kudos to Lucas Oil!!

This stopped my oil leaks for about 2 oil changes. There is no magical solution for replacing leaking gaskets, but this did help.

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It does what it says. I don't see little drips of oil underneath my truck.

Used this in my Cummins 2250 stopped the front seal oil leak. It definitely works. Tried in my front wheel seal and it stopped that leak also. Good stuff. Finally a product that works.

Didn’t see any improvement