Welcome Steven, Interesting! If I’ve got this correct, you are considering paying c£42k for a 2007 RS4 with a reasonable mileage of 82K on it over its 19 years, and you are more concerned about the depreciation during your ownership, than you are about the inevitable attention and costs incurred when purchasing any 19 year old. If RS4s are thin on the ground in ROI, then there are plenty of people trying to sell examples here on the mainland, and it seems £30K would give you a fair choice. I think we’ve all come across potential buyers who are prepared to spend many tens of thousands of £ s buying the vehicle of their choice, but get concerned about how many miles it does to the gallon! We try to be helpful on here, but if buying one of these is your dream then I would advise - just do it - you have the mechanical experience to take a chance. The economics are a different consideration, and a financial adviser would be your best choice on that. Good luck with whatever you decide to do. Regards, Gareth.