Ok the problem just didn't really get better. I took the head of and took it to a engine builder. They pressure checked it and the cylinderhead has nothing wrong. Fitted everything again. New headbolts, new headgastket, new gaskets all around and still smoked. Let it run warm and smoke slowly went away. Also this was on new fuel, earlier it just had 5 liters in and now i added another 20 liter. After a while i only got some slight blue smoke and pretty sure this is turbo related. Today i fired it up again to check hot oil pressure and again it started to smoke badly. Again the white smoke and even after having the engine heated up it still did.

Too bad i am also not satisfied about the oil pressure. Cold start up it came till 4 bar and then i guess the spring lets oil through in the oilpump. Hot oil pressure on idle was about 0.8-0.9 bar and when i rev it, it just doesn't seems to be exceeding 2 bar.

I thought i had a brand new oil pump on it, but now that i saw this i am in doubt.

Anybody ideas about the smoke? What pressure should a standard oil pump oush the spring for the overpressure circuit?

Going to try to get the oil pressure fixed and then go for MOT on tuesday. Hopefully running it warm on the streets will help to cure the smoking issue. Exhaust is full of shit, maybe intercooler too. It needs to burn it through maybe