BlueDevil Products 00234 Rear Main Sealer - 8 Ounce

After noticing the rear seal leaking on my driveway from my truck. I stressed thinking about the cost of the repair. However, my brother a master technician said, since the leak was small try Blue Devil before dropping $1800 on the repair. After pouring the Blue Devil in the transmission, I saw a very small change the first day. However, a few days later and about a 100 miles the leak is completely gone. This stuff works.

I tried this on a 2016 Wrangler with a big oil leak from the rear main (lost 3qts in 5000miles) and it did stop the leakage much to my surprise (first based on significantly reduced diameter of oil spots on my driveway, then they completely disappeared by the next oil change), well enough for me to recommend it. I read some reviews on this product and at least one customer put this in his rear main differential with destructive results (increased leakage)--THIS IS INTENDED FOR REAR MAIN ENGINE SEAL, NOT REAR DIFFERENTIAL SEAL. I'm not sure if I drain the oil, will I have to do it again with the oil change? I will update this review to answer that later. Excellent product Update, changed oil and did not re-add this Blue Devil product, still no leaks, considering I had at least a 2foot diameter oil ring on my driveway at this time last year, this is a great product.

Ok so I have a 2008 Cadillac Escalade EXT. 6.2 and all wheel drive. About 100K miles and it has had a minor oil leak for about a year or two. Talking a couple drops on the driveway overnight. Then after a road trip towing my camper around 200 miles total I did an oil change and the next day the oil leak was massive. The day after changing the oil I got the "low oil pressure, shut off engine!" alarm. It was at that point I cold see oil dumping out while idling. It was a consistent drip to the tune of 2 quarts a day on my daily commute which is only 30 miles total. Upon searching for the source I was able to see it was the rear main seal. I tried the Blue Devil RMS product. It did slow the leak but I was still losing at least a quart of oil every 30 miles or so. Now my truck is in the shop getting the rear main seal replaced. This job calls for the transmission, transfer case, cross members, drive shafts and exhaust system to be removed to replace this $30 seal. While the truck was at the shop and the trans removed I asked the shop to change the oil pan gasket as well because with my luck the oil pan gasket would start leaking a month later. Total cost is $2,000 for the rear main seal and oil pan gasket. I wish the sealer would have worked, but I guess my leak was way too much for it.

Recommended by a macanic, Worked very well, stopped a Small leak after running the vehicle for a period of time Why did you pick this product vs others?:Recommended by a macanic

Works very fast rear main seal

Very reliable

It hasn't worked on my rear main leak yet after 100 miles.

I was driving a Volvo Xc90, 189k miles, with a suspected rear main leak for what seems like forever now. Oil has been below distill level and below rear main seal level. No difference in performance, no warning lights. Put this stuff in and another quart of oil behind it back into range. It sat overnight without initially starting the car. The next day I was expecting to see the small puddle of oil. To my surprise there wasn't and hasn't been. I'm flabbergasted! I tried Bar's brand and didn't work. Im keeping my eye on this to see the longevity.