My line is -6an and i'm using holset original drain which is 19mm welded to 25mm adapter then 25mm. Oil is from adapter where the pressure sender unit us.
At first i thought the smoke was the wd40, which i sprayed it on the exhaust housing few months ago, is evaporating.
Removed the turbo the other and can only see very small amount of oil in the housing, tomorrow i'm going to test a 2mm restrictor

__________________
W123 - M111+Turbo