I have a stash of Mercury Quicksilver semi synthetic tcw3 I was going to start using in my gas as a ucl, but my question is the quick silver stuff seems to have a real high moly count hows that going to work will the moly cause issues with cats etc, does anyone have voa of various tcw3 oils, and if running a semi synthetic which one would you use. I dont really want to get into an arguement of the feasibility of using a semi sythetic, just want to know which one you think is best