[Cashburn]

There are some decent additives on the market now that can actually handle a minor leak, like the one you are describing.

Older blocks are often machined to accept the later model one piece rear main seal. In either case, just the trans comes out and it is a 1/2 - 3/4 day job. The shop that tells you to pull the motor does not work on BDRs often.

Try a simple additive first, there are better people to make recommendations than me so let's see.