Rear Main Sealer

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.

Blue Devil has always been a great product!!

Amazing! 2000's Ford Ranger 4.0 for my 87 yo father that developed a main seal leak and was really smelling bad. Poured it in and within a day or so the oil smell was almost gone. Very happy with results.

Did just what it was supposed to do very well It stopped a full scale flow

Do not buy this if you have 3.5 Honda engine or possibly any engine with VCM. Ran this for my wife’s 2008 Pilot for one day and it clogged the VCM module causing low oil pressure and forced the car into limp mode. Fixed after i changed the oil and ran MMO beforehand. Do not use this product if you’re a Honda owner!

I’m hoping that the leak gets resolved but so far after several hundred miles I still have a small leak. Is it less than before…not sure but it hasn’t stopped. Trying to decide if another can is needed.

I’ve always been leery about the various automotive cure alls, but let me tell you about this product. First off, this was used on a 2007 Chevy Tahoe that has 175,000 miles. Unfortunately, it had a cracked radiator and my daughter didn’t notice that it was getting hot before it threw a overheated code and shut down the engine. Before this, although it had high mileage, it wasn’t leaking water or oil. I brought the car home and replaced the radiator, hoses, and while I was at it the drive belt. Upon start up, it started dripping oil from the rear main. I wasn’t happy at that point. I really didn’t have the time to deal with replacing the seal and knew it would probably cost $1500 to $2000 to have replaced at the shop. At that point, I started thinking about giving a sealer a try. I figured for the under $20 cost, it was worth trying, although I had my doubts. After pouring the product in the engine, we started the engine and allowed it to idle for about 15 minutes. It still had the drip, although I knew it needed longer to react. The car was then driven on a few short 20 mile trips while observing the drips once parked and idling. The drips that began as about one per 20 seconds had been reduced to one every 60 seconds. After about another 100 miles, the leaking stopped. Currently, the Tahoe has had an additional 1000 miles put on it and still no leaks! I am impressed! I don’t know what will happen in the future, but it’s sure working now. I would highly recommend this product to any of my friends or family without any reservations. I’m so happy that I decided to give it a try. Follow up 2 months later…. Still no leaks after 2 months and another 1500 miles. Very happy so far!

I added this to my old trail / woods rig, 2002 zr2 blazer. I’d take this rig out on the highway and about 10 mins the oil would be leaking on my exhaust and looked like a coal train going down the highway. I had a combo leak of oil pan gasket seeping and my rear main seal . I put this in and ran about a hour the first day. Noticed an improvement. I drove this 2 more days in row for several hours. This has not only stopped my coal train from smoking but it’s down to a hardly visible tiny little oil spot . I can actually drive down the highway , not just the back trails now but I don’t see or smell any oil burning onto my exhaust anymore. This saved me a ton of money for my old rig. I’m not sure about others but this stuff worked outstanding for me . Simple as pour it in and drive . I also used the trans sealant and it worked just as good . Blue Devil products worked wonders for me, great stuff !

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

Used as instructed. Leak is the same

Good product

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