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Had the car in for 30k service last week.

apparently the viscous fan over engaging is a known issue in the Series 5. It's going back for a new fan tomorrow.

Hi Mate, how did you get on with this noise?

my new S5 is doing it a lot, the S4 only did it very very occasionally, wasn't really an issue so wasn't concerned. The S5 does it so much I think...