Rear main leak reccomendations
 

In lieu of replacing the rear main seal, does anyone know of a good sealer to add to the oil to slow or stop a rear main leak on an older vehicle?? I have read on line that Blue Devil and Bar's makes very good products. Anyone have any luck with these products/others or are you wasting your money on "snake oil"??

Thanks Rich

Some products are claimed to soften or revitalize the rear seals; Rislone or Wynn’s has a product that may help. IMO I think it is not usually the rear main seal but the back pan seal. Usually if the rear main seal is leaking it is usually because some brg material or other foreign particle has damaged the seal. That’s on neoprene type seals.
Best way I have diagnosed it is to put it on a hoist & with car running at fast idle look up at that area with a trouble light, if it is the rear main seal you can usually see a few drops of oil wick out after about 2 minutes.

I assume you are talking about the dreaded small block chevy leak? No easy solution, as it is a very common problem. My 302 went about 3 months after rebuild before it started leaking again. Why Chevy went to the one piece rear seal in 1986.

Yes, it's on a co worker's vehicle. Seems to leak more when the engine is running which makes me believe its the rear main..

Rich

Any leak but a drain plug leak will be more prominent with the engine running. I hope you are able to get it sorted.


Jason

Much Obliged to all who responded...

Rich

Rich i had some luck with Bars Leak rear main seal stopper. I had a rear main leak in my Suburban i owned a few years ago and it helped. Bars products are decent. Give it a shot. Good luck.