How much per year do you consider "normal" for your Mercedes. I've just sold my exactly 8 year old 209,which I've had from new, and it has cost me £4k p.a., meaning it has lost 91% of it's value. I paid 12% off list for it. I've owned Audis in the past, kept them for 3 or 4 years and they always cost me £5k p.a. (more than that in today's values). The facelift 204, which I've just bought, is 6 months old and I paid 26% less than list price = over £8k in 6 months. Suspect I would have managed some sort of discount had I bought new, but not that much! Both cars were bought from official dealers.