NO LEAK 20401 Engine Oil Stop Leak, 16 Fl oz.

this stuff works and doesn't harm engines. in fact, all the No Leak products actually stop leaks and I've been using all of the products for years in all my old vehicles. it will not stop catastrophic leaks. it does reseal leaking gaskets and seals, but you have to put more in every time you change your oil.

didn't work for my car but the leaks are too big. may work for minor leaks. been working on cars for over 30 years so may be worth a try for small leaks.

Update: As I said earlier, the leak stopped. My clutch master cylinder began leaking and replacing that plastic part involves taking half the truck apart! My mechanic replaced the main seal. He said that the old seal had swelled about double in size and was bulged way out. I poured this bottle in and drove for 2000 miles. Perhaps a person should only drive 500 miles before replacing the oil to help avoid over swelling. ...........................It is good at making a seal swell. Perhaps a bit too good? I used this on my F150 after learning that main seal leaks are common on my 4.9 liter straight six. It has worked so far. No more stains on my driveway. I hope that it continues to work.

Car dropped a couple drops each time I parked. Over a year, I tried 4 different products. None worked at all. NO LEAK was a bit slow to work but after I took a trip, the leak has stopped. Better than the multi-thousands I was quoted to have a garage tackle this problem.

I have an old second car that had an oil leak. I did not want to spend a substantial amount of money to replace the seals. I had already tried two other brands of leak sealer with no success. I almost gave up, but decided to try this 20401 treatment as a last resort. Finally I found a product that worked amazingly well. It completely stopped the oil leak. I do not know how long it will last. I am even ordering more of this product now, in case it is needed in the future. Hope it works for you.

This stuff did not fix my leak. I still lose about 1-2 quarts a month from some sort of mystery leak. Didn't work for me. Nothing more to say.

My F150 has 180k miles and was starting to use a noticeable amount of oil between changes. With nothing to lose I read up on stop leak products and chose No Leak. It took a good 250 miles before it started working and by 300 miles the leaks had stopped. I've since changed oil and so far, still no leaks. I don't expect it to work forever but I'll update if anything changes.

Not sure if it works, I have 352K mileage on my 5.7L Toyota Tundra that has oil seepage

Se utilizo en motor 4.2l. Vehiculo americano. Si se termino el goteo. Pero el problema era mas bien la valvula PCV que se debia cambiar para reducir consumo de aceite, y que ocasionaba que el aceite tambien se terminara fugando y apareciendo en diversos lados del motor.

good

Super soddisfatto. La mia BMW 2.0 N46, aveva un problema di fumosità blu se lasciata da calda qualche minuto al minimo e poi si dava un accelerata. Mi hanno preventivato 2000 euro per rifare i guidavalvole e ma si sono riservati di raddoppiare, se toccava rifare anche le fasce elastiche. Per ora dopo aver percorso circa 200km il problema è sparito completamente. Ho fatto circa 1500km e x ora nn posso dire altro se nn essere contento.

Compré coche sin saber que tiene pérdidas de aceite, 1litro cada 2.000 -2.500 km aprox, según trayectos (el anterior dueño con toda su "honradez" dijo que era normal... que rellenara, lo dijo una vez comprado, mucha cara...). Este producto hizo que perdiera menos, del orden de 1litro cada 3.500 km, durante unos 8-9 meses, después volvía a perder al mismo ritmo. No hace milagros y la averia es más que de sellar juntas, pero hace el apaño hasta que el motor no de más de sí y pierda aceite a mayor ritmo, de momento me sirve para revisar el aceite cada 2 meses en vez de cada mes.

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!