The apex seals require lubrication, and as they are practically located in the combustion chamber, some oil is going to be burned. So to get technological, it's not a dilemma or dependability problem insomuch to be a consequence with the rotary’s structure. I'm from France and lately addressed Craig at https://judahvxxyw.blogitright.com/26680943/not-known-factual-statements-about-rx7-13b-motor-for-sale