Hi chaps, I'm new to these forums and need some help and advice please. Our 2007 A3 1.9TDi's engine broke on the motorway at high speed a couple of days ago, the recovery mechanic said one of the pistons had broken away and come out through the "bottom of the engine". There was no warning, just a loud pop/thump and then dead. I've not had a chance to get under to see exactly what happened or where yet. Is this as common a problem as it seems? What is the probable cause for a