Its okay to look inside your motor while its running. With our clear cam gear cover you can see your motor turning and check the color of your oil without pulling out one bolt. Building on the success of this product from last year it is totally redesigned for 2021. And this cover weighs half as much as your OEM cover. The housing is machined from aircraft grade aluminum and the lens is made of a tough polycarbonate that will last in temperatures that would cook your motor oil. The O rings are of course high temperature also.