I am running 20% oil in my Saitos. I know this is probably not necessary but Satio does say to run the 20%. Anyway..... as a result.... my engines leave a real cool looking smoke contrail behind it. It shows up real good with a clear blue sky behind it.
I was running 15% nitro - 18% oil, then adding synthetic oil to 20%. (Wildcat premium extra, and their oil is 80% synthetic and 20% castor). I just started using their 4 cycle fuel .... ALL Synthetic. ( I also added 2.5 oz. of Syn. oil to bring it to 20% too). I am not trying to start a fuel thread here... I have been there before!!! I have a question or two. I love that smoke trail. My Spacewalker looks so cool on a low pass!!! Is there anything that can be added to the fuel to make the engine smoke a little more? (beside adding more oil!!)
Needless to say...... I don't want to damage anything, or actually add a true smoke system. What do you think guys?? ..later..lownslo

Adding more oil will make it smoke more but you will lose power. Wildcat is good fuel, and Jerry is proud that his product is low smoke, certainly it is beneficial to have low smoke in some circumstances. However for best smoke output run Coolpower 30% Heli fuel. This has 22% low viscosity oil and smokes like nothing else on Earth. The big Saitos (the 150 and 180) smoke well anyway, but on the 30% it is incredible.

Chris