Yes yes. I get that. But, im saying that clearly there are engines that are designed to run on both types of fuel. My question is, what, if any measures do operators of these engines have to take when running the different fuels to account for these problems.. Apart from the rotax schedule of extra oil changes. Whats the difference. if its enough of a difference for some of you to blame the fuel for overheating the engine to FAILURE, then surely it would be enough of a difference to warrant standardised handling of the engines with different fuels.. of which there is non that im aware. Please tell me if im wrong.