I played around with this setting on my 05 4.8is to try and see it if has any impact on a diesel like noise that I am getting at low rpms. After adjusting it and driving it for a few days I got a CEL and when going up a pretty steep hill and giving it gas it put the truck in engine fail safe mode. Still trying to figure out the source of the diesel like noise, my Indy told me after putting a stethoscope on it, it almost sounds like its coming from the intake manifold. I am not convinced yet. But the downside to the valve lift at .8mm was the CEL and engine fail safe mode. So back to .3mm it goes.

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2006 X5 4.4i Sport (N62)