Without attempting to stir up a can of worms, I have not found a valid reason to add any type of cleansing agent to model gas engines. Myself and others, day in and day out, normally fly readily available R/C gas engines for a continuous period of 10 to 14 hours a day. That's in any and all weather enviornments, at altitudes from sea level to above 8,000 on a regular basis, and up to 19,000 on rare events. These engines fly for 100 hours before they are seriously checked for any abnormalies, and as a rule are not re-built until they reach a running time of 300 hours.

Our particular group averages a minimum of 1,200 flight hours a month, and, no, there is not any type of in flight mixture control to assure that the mixture stays perfect. The carb needles are set once before the plane goes up the first time and probably won't be touched again until rebuild time.

To date, using normal gasoline and Bel Rey oil at 50-1, I have not seen any need for a cleansing additive. With the above in mind, I truly believe that the amount of experience we have gained in day to day operations qulaifies me to make the fairly blanket statement that there is just no need for this type of additive.