There is a ton of misinformation and misunderstanding in this thread. How do you have the catch can plumbed in? If you have stuck rings then increasing crankcase vacuum isn't going to help as much as it should with the oil burning. Maybe starting a new thread would be a good idea as this one is getting really bogged down and hard to follow.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)