From day one of ownership I've felt my Q5 consumed too much oil, roughly 1litre/1000miles. Last year Audi replaced a valve (don't know any more than that) and things significantly improved. Anyway long story short and consumption was 1litre/800miles approx. Audi have now completed a two part oil consumption test and agree there is a problem. The next stage is to replace the pistons and con rods. Has anyone else experienced this? It seems like a significant 'repair'.