The reason gas goes into the oil is simple
An engineering marvel really
Since the engine is gdi, no injectors spray oil on the vavles to clean them. Well with turbo and all the vavles get a carbon buildup. So to help mitigate that, gas in the oil
As the oil makes its way to the intake, and over your vavles, the gasoline in the oil helps to clean the valves. Which is why 93 octane is recommended, to keep a high octane fuel cleaning the valves!
I love science!!!