There is no oil in the fuel of direct injection 2 stroke engines that use external charging. I have been curious about the lack of interest in 2 stroke direct injection of gasoline engines for a great many years. It’s such an obvious combination. Of course the phenomenal horse power per liter of dirt bike engines isn’t possible in larger engines due to limited RPMs of longer strokes but relative horsepower to displacement and weight would see a meaningful increase over 4 stroke engines.