Why has my Audi A6 depreciated so much? I bought it in March 2015 as a 142 ex demo for €41,500. It has 89,000 km on the clock and is very good condition yet I can only get €20k trade in. That’s over 50% depreciation in 3 yrs. I expected some depreciation but not that much particularly on a premium brand. Is that fall normal? Is it because of the glut of diesels on the second hand market. Are diesels depreciating faster than their petrol counterparts? Thanks