How important is a full dealer service history for maintaining the resale value of my Aston Martin?

Is it true that Aston Martins suffer a reduction in value if they are sold without a full Aston Martin dealer service history? If so, how much does it reduce the value compared to the saving from having my local garage carry out the service on a DB9? The Aston Martin dealer's small service costs £900 and a big one is £1500, but my local garage can do it for far less.
If you ever want to sell or part-exchange the car to an Aston Martin dealer then yes, it will have diminished value if it does not have a full Aston Martin service history. This is because customers who come to the dealer will not want to pay as much for a car which lacks a full dealer service history. The same applies to most prestige cars.

As such cars get older it can become acceptable to have them serviced by a marque specialist who is not a dealer, particularly in the cases of Porsche and Ferrari. But a 'local garage' will simply be incapable of servicing this type of car as it won't have the right tools, fluids or necessary diagnostic equipment.
Answered by Honest John on

Ask Honest John