I read here somewhere that certain synthetic oils are not compatable with leaded gas. Said that the syn oil cant clean the lead out of the ring lands. Here is my problem. I have a Hi-Performance 4-stroke atv. I has 11.3-1 compression from the factory. It has a sticker that says 92 octain or higher. I can only get 90 octain at the gas station and the bike pings on it. I don't want to burn a hole in my piston (again!). So I'm toying with the idea of mixing some race gas with the 90 octain unleaded to increase the octain a few numbers. I cant find unleaded race gas, only leaded and I'm running Mobil-1 10w-40 oil. So can I run leaded gas with this oil? Also say I mix one gallon of 100 octain race gas with one gallon of 90 octain do I get 95 octain?