I have an 03 WRX and rebuilt the engine about 500 miles ago. I had a few minor problems but nothing too bad. The two biggest problems were the leaky thermostat housing and an oil leak that appeared to be coming from the passenger side valve cover. I ordered a new thermostat seal and a new valve cover gasket from Subaru. I got the coolant leak squared away and started working to change the valve cover gasket; I was thinking that the one that was on the car might have been defective. Upon removing the gasket I realized that nothing was wrong with it. Confused, I wiped everything clean and put in the new gasket that I had just purchased. I drove the car home from the shop and hoped that the problem had been solved. This morning, the same leak taunts me. It is coming from somewhere on the bottom side of the valve cover. It isn't the oil line for the turbo and I can't think of anything else on that side of the car where the oil could possibly be coming from to land directly on the bottom side of that valve cover. If anyone has any ideas, please throw them my direction because I am ready to stab my eyes out. Thanks.