Thanks for all the additional info. but I've spent way too much time researching this already and have read most of the e38/e39 stuff on this.

So far it doesn't seem the same on the e53 - or at least on mine. Very similar but not quite the same....

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)