BlueDevil Products 00234 Rear Main Sealer - 8 Ounce

96 F-350 with 460 engine. Truck would leak a silver dollar spot when it sat. Used Blue Devil with a fresh oil change of Valvoline high mileage, it too has seal conditioners. It stopped leaking! It doesn't happen right away. Put about 700 miles on before it completely stopped.

I have a 2009 F150 with over 337,500 miles on the original engine. It developed a persistent rear main seal leak about a year ago. Having called the local dealer, I was quoted labor only of $1,900 to repair this leak. I went on Amazon to see if there might be anything out there that would help. I purchased this Blue Devil pour and go rear main sealer and had it delivered next day, put it in the crankcase as instructed and drove to Ft. Lauderdale (200+ miles roundtrip) So far, after about 400 miles, it looks to me that the leak has stopped. I'm hopeful that it stays stopped and will no longer be a mess on my paver driveway!! I recommend this product based on this outcome.

slowed down the leak but did not stop it

very good product

I will never buy this again. I poured it in my oil and started driving. After about 25 miles my oil pressure was zero and I had to be towed. When I got the vehicle to my mechanic it was just the oil pressure sending unit. The mechanic replaced my sending unit and I started driving again. After a few weeks the sending unit failed again. Its my feeling the product clogged the sending unit. The first time the sending unit was change we did not change the oil. I wanted to give the product time to work. The second time we did change the oil. It has been a week now and all good so far with oil pressure. Bad news is, after all the expense, hassle, towing and replacing the sending unit 2 times, I STILL HAVE A LEAK.

This came highly recommended by a local auto parts store for a rear main seal leak on my ford truck. I ordered it on amazon, because it was much cheaper than at the store. I tried it out, followed the directions, added it to a new fresh oil change, drove it daily for 200 + miles, and it never worked. It didn't make it worse, but it didn't fix it or even slow it down. From what I could gather from other users, it is a hit-or-miss deal. Some people have good luck with it, if their seal isn't too bad, too old, etc., others like myself find it just doesn't do anything. My leak wasn't that bad. About half a dixie cup of oil total leakage in one month's time parked. But it is a 20 year old truck, so maybe it was just too old of a seal to stretch and work. Anyway, I ended up just getting the seal changed to a new one after this lackluster experience.

We are in the middle of moving 650mi and I noticed on my first of 4 trips, that the oil cooler on my Duramax Diesel was leaking. It was leaving a 8-10" puddle under it every night. After using this my puddle has disappeared and now I get a spot about the size of a quarter. I've put 1500 miles on it and will need to get another 1500 out of it before I will have time to re-seal the oil cooler properly. But this seems to have done the trick for the time being. I Definitely recommend this stuff as a bandaid to get you buy until a proper repair can be made. Just DO NOT use in ANY powertstrokes.

I was skeptical when I first try this product on my 2001 Jeep Cherokee. The jeep has had an oil leak for many years; it wasn’t a large oil leak, but big enough to leave an ugly spot on the garage floor. I used a piece of cardboard under the truck to catch the oil drip, but knew I had to do something before the leak got any worse. Of course, the right thing to do was to replace the main seal, but I recently had knee surgery and getting under the truck to drop the transmission was out of the question. I’m not sure how I came across this product, but I’m glad I did. The day the sealer was to arrive, I used a pressure washer and some rags to clean oil residue from under the engine and transmission. The BlueDevil Rear Main Sealer arrived on Aug 29, 2018. I poured the whole bottle in my jeeps engine on that same day and then just drove the truck normally. I drove it to the store and did some other errands. When I arrived at home and before parking my truck, I placed a clean piece of cardboard on the garage floor to catch the oil drip. On the following day, I checked the cardboard under the truck and there was a new spot of oil. I reasoned I had just wasted $11.99 for the product and didn’t think anything else about it until today, Sep 20.2018. So, I went to check, not necessarily to see if the product worked, or not, but whether the cardboard was too saturated and needed to be replaced. But to my surprise, the cardboard didn’t have any new oil spots and aside from the spot when I first poured the sealer, it was nice and cleaned. I also checked under the engine and transmission but didn’t see any indication of any oil leak. So, I must say that this BlueDevil Rear Main Sealer really works. I cannot say for how long, but for now, I’m very satisfy with the results.

I used this 2 times now the leak never came back. The first time I used it I was really sceptical about this product still leaking for two days but as I drive along the leak suddenly disappeared. So when I did my oil change I pour another bottle no more leak up to now. I think it does its job kudos to the seller and kudos to bluedevil.

worked as described

Money wasting and very dangerous for turbo cars

Good product

After a couple of weeks it seems to be doing as advertised, time will tell.