Have an oil leak in my 2000 S80. Dealer says its the rear engine seal and the breather box seals. I want to call around to get some prices because the dealer wants a few thousand to replace the engine seal and the breather box seals. What are breather box seals? How long does something like that take to repair and what should I expect to pay? Is there something else that should be fixed to prevent these from leaking again??Thanks!!