Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

In the early days of larger gas engine rc gas was prepped by adding a little castor oil to the mix. Then Klotz came out with two stroke oil with castor built in. Old guys still added some “just to be safe” I guess. I did too. But it really bunked up the planes and was very hard to clean up.  Performance wise I never could detect a difference. I gradual went from 40 to 1 to 60 to 1 then 100 to 1 . In tests on one day of all the different ratios there was a gain in power on the 100 to 1 . I continued using it for years that way. Never had engine issues. . My son has a landscaping business an all their 2 strokes run this. Their motors out last the mechanics of the equipment.  The biggest thing now is to use only non oxy premium as there is no ehtaol in the gas so it can be stored very long an not gum up the carbs. I did a test of this on my big cruiser boat. All marinas in the area only sell non oxy premium gas boost never have water in the fuel that is not from condensation. At the marinas this is a big problem that is hard to deal with. Boat surfaces get blistering hot during the day then cool at night causing condensation everywhere including inside the gas tank. Occasionally you have to just have the tanks pumped unless thy have drains at low points. Plan on frequent water separator changes.   When I tested I tried both marine gas an gas station regular. In about one month gas station regular was clouded and showing separation. It I’ll not remix. This is why marinas don’t like you bringing your own gas down to the boats.