Very high concentrations of MMT are incompatible with “active” surfaces. When used as directed, the street-legal quantity in our Octane Booster Fuel Treatment (part #1512) does not present a problem, even with continuous use. However, the concentration in MMT+ Octane Booster (part #1516) is substantially higher. If not diluted enough in gasoline, the metallic component in the product can eventually build up on oxygen sensors and catalytic converter(s), potentially causing erroneous readings and catalyst fouling. Your gas tank is fairly large compared to the average automobile. It is possible that you might be able to “get away” with using a full can of 1516 per fill up for quite some time—maybe a couple years worth of average driving—without having any fouling problems. Eventually, though, you will likely have to replace your oxygen sensors, catalytic converter(s), and maybe even spark plugs.

Would it be safe to add 2 bottles of #1512 to 24 gallons of fuel or in other words, what should be the minimum safe amount of fuel to mix with one bottle of #1512?