Allright I just picked up an 88 Subaru Justy 1.2l 3cyl with 4WD. The valve cover leaks, rear main seal, and distributor seal thay all leak. I am going to pop new seals in. So the previous owner tells me this vehicle has over 450,000 miles, I dont believe that. probally 250,000 or 350,000. Anyway the engine has a little bit of a sludge issue should I try some auto RX or would this probally be a waste of time. By the way oil capacity on that car is 3 quarts.