Lucas Oil10278 Engine Oil Stop Leak - 1 Quart

Well, I bought this because a mechanic put synthetic oil in my friend's 99 Buick LeSabre that had never had synthetic oil. The engine had 175,000 miles on it and never has seen synthetic oil. After running the synthetic oil for about 5,500 miles, a few drops were visible here and there. So, I figured that changing the oil back to organic oil and putting some of this in would fix the problem. I bought this in the winter, but I waited until we got hot weather to use this since I don't know how this will work during -0 degree F starts since it looks very thick.So after changing the oil and filter (using dinosaur oil), I put the whole quart in (I did not overfill). I figured that a 16 year-old engine with 180,000 miles might need to have all the o-rings and seals rehydrated (if that is what you want to call it. The GM 3800 series II stopped dripping the occasional drop after about 1 week. I will take it to the carwash to pressure wash the bottom side of the engine and degrease it, just to see if there is any new oil. But so far, the oil pressure does not seem any different and the oil stopped dripping.So take it from me, putting synthetic oil in an engine that has a lot of miles is not the end of the world. The mechanic put synthetic oil in it because there was the manifold antifreeze leak that could have gotten in the oil. So just in case, he used synthetic once he fixed the antifreeze leak and changed the oil. I do think that the synthetic oil cleaned out some deposits inside the engine. But it only started to leak a few drops, this oil treatment seems to have fixed the problem.I will try and see what happens after the oil is changed again. And, perhaps some can tell me if this would have been OK to use in winter, it sure was thick!

This product has been negatively reviewed far too many times, and I felt compelled to write a review on it. I have used this product on 3 cars with oil leaks, and my family has used it on their cars as well. My family has had great success with minor oil leaks, and 2 of my 3 cars I have used this on resulted in their oil leaks ceasing completely. My other car turned out to be a decent sized crack in my oil pan gasket, which explains why throwing some Stop Leak at it didn't solve my issue. This product helps greatly to repair old, hardened seals, but it doesn't falsely advertise to bring about miraculous results in moderate to major issues. My point is, this product works extremely well for it's intended purposes, and I feel that all of the negative reviews should be taken with an grain of salt. It would be spectacular to hear, from the negative reviewers, what sort of issues ended up being diagnosed in the cars this product didn't help. I'm by no means trying to put down the negative reviewers, but it does get a bit frustrating reading reviews on Amazon like "Put it in my car, didn't work, still leaking, crap product" or "I contracted a flesh-eating bacteria, and this 'highly rated' Neosporin didn't work. Don't waste your time. 1 star. Booooooo!!!!" Lucas Stop Leak is a great product for it's intended purposes, has been used and trusted by amateur and professional mechanics for years, and fully deserves a solid 5 stars.

Purchased in hopes of fixing a manufacture defect with the Chevy Terrain vehicle. Burns oil because of poor design with engine. Just used first quart so will be a few months before knowing if it works

When I went to go get my oil changed in my older Honda civic the guy told me if I had more leak any show me where it was coming out front and you said that’s why there’s black here it is from the oil it’s not leaking out a lot but there was a seal. in the middle of those four things that connect up to your pistons or whatever the heck it is called. But the main thing where the pipes are over that part that connects it to the next part there’s a seal there and it was leaking it leaks very very little. But I said to myself you know what I can see it’s leaking a little bit so let’s go with that. I got robbed for $28 they charge me for this thing. So I thought it was just them trying to do your usual upsell because that’s what these places do. They are notorious for it. It was Pennzoil. But you know what I wiped down the part of the engine that it had oil on it I have never seen any oil leak again. So my determination is that works. Now of course I took it to a mechanic to talk to about something else and he noticed that there was a problem he said there’s oil leaking here little little tiny bit of burns off though and he told me that that stuff is garbage and it doesn’t work well he wanted me to buy his services and I did. So it works for me. I don’t know if it’s gonna work for you or for a larger leak but it works for me