Quote Originally Posted by blacksambo View Post
It seems like my rear seal is leaking. I've changed the PCV, and the filler cap seal recently. I wonder if BAR's sealent or some other concoction would help. I'm using Mobil 1 High Mileage oil, 10W 30. Maybe that's too thin for 138K miles?
I dunno that I'd go too much thicker on the viscosity. The closer tolerances on a modern quad cam lump require the lubricant to be able to move through those same tolerances to be effective.

Are you gonna replace the crank too?