I had this problem on my 1.9 pe engine. The engine bay would be full of oil from the dv. It was a fucked piston that was the problem. A bit of the crown on the piston had broken off along with the ring and was causing air in the bottom end. It would throw oil threw the turbo and intercooler from the breathers.My air flow meter would be about half inch full of oil. Do a compression test and you will see if a piston is down. I was 2 bar down in my piston. My oil cap was blowing off aswell.