Hello Bin Grad desperate. My motorcycle had little oil in it. Wants to tip what I also did.. 20w50 is on my last bill when changing oil.. assume that the mineral oil was/is in it. Then I accidentally tipped full synthetic oil 20w50 on it.. had the motorcycle also had a short time on afterwards.. my question, is there something bad happening now with my engine? Someone told me that you could not mix these oils.. could clump… or get greasy. Should I rather leave the oil completely out of my oil tank and then tip new ones in? Oh yes.. after I had to fill it up shortly after the oil, I looked again after the oil stand. It seemed strange to me then, because the oil in the oil tank looked like foamy.. that is not normal or. Use your advice.. Thank you Greeting Felix