I'm losing maybe 1/4 of quart per 4hr set of wakeboarding. It's going into the bilge and making a mess. Valve cover, oil pan, and everything else looks very clean. The only thing I can come up with is the drain hose on the pan. I can get a hand on the fitting but am not sure how to get a wrench on it. Can I replace this with a standard drain plug. Any (inexpensive) recommendations.