Thanks Matthew, I think we are at cross purposes. I understand all that and how the system works, I am talking about the oil return pipe from the turbo which mustn't cause any back presure to the trubo bearings not a drain from the separator. My question was about the diameter of the turbo oil return, larger turbos seem to be about 15mm and smaller ones 12.5mm, sop was wondering what you guys had. Nigel
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