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Old Nov 26, 2012, 12:48 AM
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NSW, Australia
Joined Feb 2011
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I'll second the advice here, in that I fly my engines on a mixed castor/synthetic homeblend of fuel. I find that 10% castor / 10% synthetic is a good blend for smaller, older type engines such as the Cox .049's that I like to run. They seem to thrive on it so long as its got at least 15% nitro in there, too.

Anything larger I generally run zero or 5% nitro, 9% synthetic and 3% castor. This might seem like low lubricant levels to some but it does work and my engines haven't lost compression... well at least not yet! I also like a grade hotter plug than standard to take advantage of the low or no nitro fuel.

Having said all that there is a guy at the field who runs FAI 20/80 mix exclusively and has been running the same OS .46 for over 20 years without problems.

Cheers - boingk
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