Originally Posted by Strange Mud
did you have a reason to put in an additive?
Opinion only but unless it really is snake oil I wouldn't (and the only reason I would consider that is I don't like snakes).
I use Marvel Mystery oil in the gas of all my motors. I thought my gas mileage had gone down after adding MMO to my Mustang. But I was wrong. My mileage has really dropped, to the 14 mpg range. So I will go back to adding MMO!
MMO isn't snake oil. It's been proven to me to lubricate the top end of the motors. I could give you examples but I won't bother you. I will say my Garden tractor motor had loud lifters, and MMO fixed that.