Some people are really into castor oil. I often wonder why. I suspecrt there is a nostalgia factor, since castor oil has been used as a lubricant for many years. I believe it was used in the WW-I open-cockpit airplanes when the engine oil lubrication was partly outside the engine and the pilot got coverd with engine oil. He had to breath a lot of oil. Is that why they used castor oil?

I love the synthetic oil used in my fuel. That is the ONLY fuel I use today. What I love is that it does not burn on the cylinder head so the engine always looks brand new. I feel the engine runs cooler without all that burned oil covering the engine. . Sometimes I am embarassed at how little care i give my model engine. All my engines are OS 46 FX or AS engines. I NEVER use after run oil. I NEVER run the fuel out of the engine. Some of my engines are over 10 years old, and I fly a lot; about one gallon every two weeks. Sometimes I wish an engine would wear out so I could purchase a new engine.

If you love castor oil, use it. I'm not certain but castor oil may have been the oil in the fuels when I started in R/C in 1972. Back then I used to rebuild my egines with new pistons, con rods and bearings. I would NOT do that today. I prefer a clean engine than sticking with a nostalgic oil. Sure wish one of my engines would wear out.