Can Mogas cause excessive carbon build-up?
I have just removed the cylinders from my C90 and was surprised to see how badly coked up the rings were. The top ring in three of the cylinders was almost completely seized in and the lower two not much better with a large amount of carbon in the lanes. The engine has only done c.200hrs since zeroed in 2006 and was running very smoothly with no problems that I had noticed. The Isenburg guru suggests Mogas additives might be the cause of the first ring sticking and starting a chain reaction. Anyone else experienced this recently?I've been on Mogas more or less 100% for the last 10 years. Will probably move back to 100LL unless a better solution is offered!