You only lose £2k a year on average, you need to have kept it a few years to get an average. The 3.5k you are seeing is pretty normal. Buy the car and take it back to sell it again the following day and you'll loose £1.5 - 2k, because that was the dealers mark up. You lost another £1k in normal depreciation. Your lucky only to have lost £500 - £1k as a result of the diesel issue and the fact new shape C class have started to come into the second-hand market, so your car is no longer a current model. I always knew would lose money from the off, was just shocked at how much. I put through a we buy any car type thing last night and that was 1k higher than the dealer had estimated, so thats not as much of a sting. Question is, what is the best option from here? Do i stick with this and see how the market goes considering this diesel speculation or do i cut my losses now and go back to a small petrol.