My post #8 did not suggest all castor oil fuel as you infer in post # 10. Let me rephrase, my expericence with fuels containing even some castor oil was resulting varnish. Like Red Head I have engines 25 years old run on nothing but Cool Power 15 % still working fine. Why is it the castor oil crowd, insists that only their opinion can be correct and refuses to acknowledge anyone else's expericences. This issue bores me and I will leave all to thier fixations.