NO LEAK 20401 Engine Oil Stop Leak

Completely stopped my old car from dropping oil. Takes the 300 km to do this so users must be patient. It does not work immediately!

Worked for about a month leak come back eventually

Didn't work as the car needed a new turbo no idea if this made it worse but to be honest the turbo seals were loose in the engine which the mechanic seemed to think this might have done

Absolutely fantastic product, we had a leak somewhere in our engine which was dripping on to the exhaust and smoking when we were driving but without stripping the engine down our mechanic couldn't find the leak, gave this a try because if it didn't work it was only a few pounds. It has worked and mended the leak that would of otherwise cost us hundreds of pounds to have the engine stripped down. Amazing product.

Had a crankshaft oil seal leak on my X5 ,tried this product following the makers instructions and the oil seal is still leaking.So I wouldn’t recommend using this product.

Seems to be working, have now done around 500miles since my oil change and my level of oil is being maintained. If it hasnt fixed the problem completely its definately bought me some time to get some money together for a fix. The only issue is there is no measurements on the bottle and the only information you are given is one bottle treats up to ... litres of oil. I ended up working it out and using scales to get the right amount i needed. I appriciate some people would just use the whole bottle and i dont knock it but for me its lacking in accuracy unless you do what i did.

Had a leaking Oil Cooler and Leaking Rocker Box.Used this sealant and drove a couple of hundred miles and so far no more signs of leaks.

Added a bottle to my 3.0L diesel with a weeping crank oil seal drove for 1,000 miles with no improvement. When I reread the bottle I noticed that my engine held more oil than you can treat with a bottle so I tried another - no change, no improvement but I now have two bottles of an unknown substance in my engine.As there was no difference I am going to service the car again to remove the ‘snake oil’ as I do not want to risk adjusting the viscosity of the oil.I was skeptical about this working but the reviews seemed to suggest some people had success but unsurprisingly it doesn’t work.Avoid, sadly.