There is moisture on the valve cover of my 240 and i'm pretty sure it's gas. I think i can smell gas when i accelerate hard and i really want to get this taken care of. I was thinking the plugs aren't torqued down hard enough. what else could cause this? i think it's not torqued enough because all of the plugs are doing this. and i think they changed them before they tried to sell it. EDIT: i would put this on nissantech but not too many people go through there.