Well, after over 7 weeks in the dealers I got my car back - it seems there was no oil control ring on one of the pistons! they couldn't find any sign of it, no bits in the sump etc so it looks like it came out of the factory without it!!! So much for audi being a quality manufacturer! Anyway, i've now done 2000 miles since getting the car back and the light hasn't come on yet so hopefully it is fixed. Interestingly I had two different courtesy cars, both 2.0 tdi and both needed the oil topping up while I had them (<3000 miles) so it does seem that excessive oil consumption is a feature of these engines.
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