I changed my oil roughly 2000 miles ago and I recently checked my oil and found that I was 1.5 qts low. I have had trouble with oil leaks from the valve cover gasket so I replaced it, and it seems to be holding up ok, I think. Since replacing the valve cover gasket and cleaning the valve cover I have noticed an accumulation of oil gunk around the rear valve cover breather. It looks as though oil has been leaking down the sides of the engine block. Could I be leaking that much oil from the valve cover breather? If not, what could it be?