hi just bought an a6, it is an old motor but is tidy. Made one mistake didnt check it well enough, the pleasure of dealing with ebay is there nearly all heaps of **** and the owners are worse. Any way I bought it with a small amount of smoke come from exaust and understanding it cleared when moving which it does do but what he failed to tell me was it had '0' oil in it. When I put oil in it did smoke alot more but still only when slowing down for a junction or round about or going very slow. I started out thinking it was a ring gone but it runs way to smooth , so I thought head gasket so had the water tested and it was clear. I have got no idea and am n ot mechanically minded so any good suggestions apart from get rid as I absolutely love the comfort and style of the car , but the smoke i could do with out.