BlueDevil Products 49499 Oil Stop Leak - 8 Ounce

The product worked as advertised

As expected.

Must run it,a couple of hours actually couple of days start n run put it off let it stand ,give it times to work n start n let it idle 1 to 2 hours and then stand another 24 hrs,be surprised with the results,pretty much high n dry ,works as promised.will stop small leaks dont know about broken seals or damaged seals.pretty much stops small leaks for sure,expect to see results only after u empty half a tank of fuel atleast ,over a period of 2 to 3 days,depending how much you run the vechiel.thanks

My Pajero has a tiny leak from the cylinder head (just sweating). So I bought this product to arrest the leak. However, this product failed me, and the leak remains. Finally, I decided to take my car to a technician to get the problem fixed.

Excelente sellador de fugas de aceite, lo envié a 2 talleres no encontraron la fuga y lo probé y al momento se detuvo la fuga, seguí las instrucciones estoy feliz me ahorre un buen dinero.

BlueDevil Oil Stop Leak worked exactly as advertised after a leak recently appeared in my valve cover on a 1998 Toyota Sienna with 455,000 km. After changing the oil, filter and adding BlueDevil I drove the car for 3.5 hours. I have used Amsoil 5w30 synthetic oil for many years without any noticeable oil leaks. I will now change my Amsoil more frequently 3 or 4 times a year as opposed to 2 times per year. Also I will only use Amsoil, because Amsoil is a better synthetic than many other synthetic oils. Very pleased with BlueDevil oil stop leak which stopped the leak. This was the first time I used BlueDevil and am very pleased.

Added this to my car that had oil leak and it worked for a few weeks but then started leaking again . Did not fix problem it may have slightly improved but leak is still there . I was septic from start but gave it a try .

Worked shocked seal was weeping on a timing chain cover stuck it in and bang no not the engine and the weep had gone

I have a minor rear seal leak and BlueDevil was recommended by a couple of different mechanics. It worked well for several months and I've used it a couple of times. As you may know, these treatments can only do so much, but if the leak is minor enough, it will work for a while. Replacing the rear seal is a very expensive job, so I have no intention of repairing it on a vehicle with 207K miles.