Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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The N20 had a much cleverer oil mist minimisation strategy then its predecessors and a better recovery system...I looked at in detail and even on opening up the intakes found at 50k miles little to note when compared to say the N54s..
2012 E89 N20 MSport Auto Atacama Yellow Fully Loaded plus some..details here.. https://www.dropbox.com/s/yqrmrnxmh7tq6 ... e.pdf?dl=0