For almost my whole time driving, and dozens of different vehicles, i have used MMO in the fuel, and NEVER has one gave me even a check engine light, or had catalytic converter issues. They were all sold/junked/upgraded and not because of engine trouble. (unless its a ford 3.8L) I have used MMO religiously at recommended dosages, usually 4OZ per 10 gals of fuel, and sometimes even a little "extra" and really believe it does help, but not instantly.. This is a product you must use for tanks of fuel to see the benefits. I use 91 Non-Ethanol fuel along with 4-6 OZ of MMO for every 10 gals and the engines always run better than the mileage on the dash would suggest. Even in the Elantra, i had a mechanic buddy drive it recently, (that does not know i use MMO at every fill up) and they even said how "smooth" and "peppy" it feels.. Now it could be the non-ethanol premium fuel, or it could be the MMO is cleaning the fuel lines, and lubricating the fuel pump/injectors, and giving the cylinders a touch more cleaning/lubrication thus a slight higher compression and that in turn means a "smoother" running engine especially after some time of using it.. I know MMO will not fix a worn out engine, or one with shot rings, but if you have a good foundation to start with i believe MMO does help..
Now, that i said that part, i will say this. With today's advance synthetic motor oil's, i would never use it in the crankcase, unless there is sludge that i'm trying to clean out or something "extreme" but will continue using it in the fuel, for the foreseeable future. It is priced right at WM about $3 dollars a bottle and the very slight increase in gas mileage,(I can not say how much because there are far too many variables), plus the for lubrication and cleaning properties, and having more "pep" and a smoother running engine, its a win for me, and the results that i noticed first hand make this product worth it.
Not everyone is on the same boat as me, and believe its snake oil, but there are also other who like me swear by it....
Lets hear your results with MMO in the fuel, good or bad.
Now, that i said that part, i will say this. With today's advance synthetic motor oil's, i would never use it in the crankcase, unless there is sludge that i'm trying to clean out or something "extreme" but will continue using it in the fuel, for the foreseeable future. It is priced right at WM about $3 dollars a bottle and the very slight increase in gas mileage,(I can not say how much because there are far too many variables), plus the for lubrication and cleaning properties, and having more "pep" and a smoother running engine, its a win for me, and the results that i noticed first hand make this product worth it.
Not everyone is on the same boat as me, and believe its snake oil, but there are also other who like me swear by it....
Lets hear your results with MMO in the fuel, good or bad.
Last edited: