No problems Luna and no hard feelings either .

BTW, I'm not saying that Castrol M is perfect either because it can form carbon deposits on the piston crown and combustion chamber. The photo below is one of my engines after about 30 hours although it cleaned off easily. OTOH my Enya 60X after considerable running hasn't got the slightest trace anywhere including the exhaust. A lot of people use small amounts of synthetic as a blend to keep the internals clean but this also removes the protective varnish which I prefer to have. I've never experienced the "sticky ring" syndrome either even with one engine that had several hundred hours on it.