Are the valve covers on Honda Pilots made of plastic. I discovered an oil leak on my Pilot and had my mechanic check it out. He called me and told me that the leak was coming from the valve cover and gasket. The valve cover had a crack in it and it is made of plastic. I have never paid attention to this before. I think that my last honda had aluminum covers. If they are plastic, I figure that it was a weithg saving measure.