Just thought I'd pass this one on. I've got one of the early 53 plate 2.0 Tdi's. Approx 25k ago it started using coolent - the dealer replaced the EGR valve & all was well. Then about 8k ago, it started using coolent again, told by the dealer that its an "A or B solution". A is an EGR valve (which they replaced again) and then after much pestering as the fault remained, B turns out to be a replacement cylinder head - apparantly some are pourous! After investigation it seems the head was leaking through pot 1. The issue here is that Audi tech's need to witness the fault for themselves before they can act. The reason I have had the problem for so long is that they have to witness the car producing white smoke (steam) on start up & mine refused to, unless it had been thrashed for a long journey & then left to stand for 2 + days. Looking forward to getting it back on Fri - got a 1.6 sportback as a loaner - can't believe how under powered it is on the motorway!