I like the MMO because it gets some lube to only areas that gas goes. But then again, I do not have any O2 sensors on my engine exhaust, and some folks have worried about using MMO when they do have. I would not be worried about that myself, because I also use MMO at a ratio of 4oz. MMO/10 gal. gasoline in my cars and SUV. They do have O2 sensors.