ORIGINAL: proptop
There's nothing wrong with adding a few oz. of Castor to Cruel Power
The ''All Synthetic'' guys get bent out of shape when one suggests adding Castor to an all synth. fuel...why is that? (it's not blasphemy ya know
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Virtually all of the engines that I've seen that were HORRIBLY rusted were run on an all synth. oil fuel. I've owned many hundreds of model engines, and have worked on probably at least a hundred of other peoples engines over the last 5 decades.
Where you fly makes a HUGE difference in whether you have rust...
If you live / fly in an arid climate, the chances of you encountering rust in your engines is considerably lessened. Where I live, it can be very humid for long periods of time...that really makes a difference.
All that being said...run whatever ya want...it's only a hobby...your life doesn't depend on it...have fun.[8D]
I have never said Castor is something to avoid, that's why I have always liked the Power Master, it's blended and has 2 or 3% added. I have also mentioned humid areas of the country adding to the rust problem. I don't care for humid climates so have always lived in Calif. or Nevada. What I do say is I have never seen an engine harmed running fuel with full synthetic. Lean runs are a mute point with or without Castor. Only problems I have ever had with Castor is gunked up bearings and snot on my plane. I think if I would always run my engines dry at the end of the day I would never have any problems at all. My bad!! If anyone is worried about it then by all means add a little Castor, I have never seen an engine harmed using it. Back when I started flying Castor was the only oil in our fuel, I still have a few nice control line engines in great shape.