Hi Kicimiao66cc,
It's terrible. I don't know whether it's down to the age of the car, I.e. 5 years or above that's making it so bad... But I can tell you this.. I bought my 2010 Q5 Quattro Japan Spec in Aug 2015 for 182k. One year later, Aug 2016, the market price is 115k. Some are even selling the local spec 2010 for 108k.

It's nice to drive, comfortable, fast, smooth and economical. But in hindsight, I wouldn't have bought it. I don't know if the same applies to post 2011 Q5, but 2.0 TFSI engine pre-2011 is problematic. High engine oil consumption. You're talking 0.5 litres every 1,000km. On top of that, there's already 4 versions of Timing Chain Tensioner. The latest version should be the good one. Mine failed only after 30,000km. This is a part that should be inspected or replaced at maybe 100,000km. Not failed at 30,000km. When it fails, it destroys the engine. Mine cost 14k to rebuild. So if I could turn back time, I'd buy something else.