[quote][Anyone telling you to run all synthetic has their head in the sand. Anyone telling you that some castor in the fuel will gum up an engine has their head further in the sand. These folks claiming this don't know that:/quote

Why are all my engines that run on Caster gummed-up while the ones run solely on 100% synthetic remain spotless inside and out?
If Caster is so much better than synthetic, why are all the heli, car and DF fuels 100% synthetic? Because they run hotter, harder and faster than most plane engines.

Someone had a thread a while back about 'Bearing Failures' -- I posted pics of two engines there.
Take the back cover off of one your engines run on de-gummed Caster and one run on 100% synthetic and tell me what you see.

Kirk