Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

I have a 2016 international prostar with a cummings engine ixs. It had a front engine seal leak. I added this at my last oil change. It took about two weeks and it stopped leaking oil. Yes I was surprised because I added only one gallon, not to mention that I really didn't think it would work. My leak was so bad it was oil was blowing on my right steer brake, this has save me some time.I have 960000 miles on my engine, trying to hold out until a rebuild .

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.

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

I used this in my Honda with over 325,000 miles, and it’s been a good addition. It helped reduce minor oil seepage and gave me some peace of mind with an older engine. Easy to pour in and didn’t cause any issues. For high-mileage vehicles that are still running strong, this is a solid product to try.

I’m a Certified Auto Tech as well as Hyundai Master Technician with over 12 years of auto tech experience. I have seen it all used it all so many products claiming to stop leaks and improve fuel mileage and boost octane blah blah blah. Lucas stop leak actually works. Now you can’t expect it to work on a mechanical failure like rotted oil pan and broken gasket but it will stop or slow down seals and gaskets that are drying out or starting to fail. Most oil leaks are from going over your oil change intervals where the oil loses its additive properties and causes seals and gaskets to dry oil and crack. I find using Lucas stop leak with a decent high mileage semi synthetic or full synthetic oil is where it works best. Do not do what you could with older cars and use 10w30 or 20w50 oils thinking cuz it’s a thicker weight it will help. You will only damage your engine. Use the recommend viscosity or u can even go from a 5w30 to a 0w30. If in colder climates like myself in CT in winter I go with a 0w20 or 0w30 in my Acura with Lucas stop leak for better cold starts as this is wear most of engine wear occurs. So a thinner cold oil weight helps it circulate faster and oil pressure to rise faster protecting ur engines internals faster. With using Lucas I go 7500 miles on my oil changes on my 07 Acura TSX with 127k miles and the oil always comes out still clean a light brown. Had a small oil leak when purchased at 63k miles and has not gotten worse since the first oil change I did. I swear by Lucas products the fuel additive top end lubricant is also amazing and adds 2mpg on average to my gas mileage as well as a better cleaner running engine.

Great stuff

Had a slight oil leak from my push mower and this worked great to stop it all together until I was able to get a replacement gasket set.

I have used a couple Lucas products in the past that have been almost miracles. Transmission Fix and Power Steering Stop Leak saved me thousands of dollars in repairs. This didn't live up to their other products, but the issue is probably my 190K engine and not the product.

Mix in juiste ratio

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I had a very slight oil leak and this product solved the issue after a couple of days of driving. It's not a permanent solution but so far no more leaking. Not sure how this would perform on more serious leaks.

Sehr gut

I own an old car and this oil stopped my leaking. Amazing