Oh yeah, you asked about the thermostat task - not too bad. Cost for OEM unit was NZ$175 so rather expensive but I wouldn't trust any other brand for this part.

Here's my post on the task: -

http://www.xoutpost.com/1079662-post7235.html

Took me about two hours, taking my time. The coolant bleeding etc. took the most time.

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