Thanks Brian,a lot of tests are not absolute but many provide indications. Anyone designing them for consideration is very much appreciated. Far better than nothing or just absolute guesswork as an alternative. Plus sometimes they can be refined into useful comparisons. This test for example screams for baseline information from other engines. The engine does create some small vacccum component. I believe or it would be unable to suck air and blowby through the air filter when pipe is connected to the filter housing. When pipe was just directed to container even that small component was gone although perhaps not too signifigant or perhaps it is. . But totally diluted by the vent pipe termination outside the filter housing. The same test made by construction of a real oil trap installed on that line might or might not give a better indication. Should though I imagine. I surmise the seals in the turbo are still suspect though. Certainly not ruled out. Could easily be a combination fault of various problems making an overall contribution. Sad their is no existing refferences until a few more try it and we get a guildline going? Have to wonder if any amount of oil would be collected from one of my engines?