In the M5, like in other E39 models, the digital dash display can lose pixels, which is irritating. It's doubly annoying in the M5 as it has a dash with unique 'M' logos that means replacement is more expensive. However, there are specialists who can restore the pixels for around £250. Facelifted M5s have grey faces for the main dials rather than the black faces of earlier models.
Other dash features to check are the coolant temperature and fuel gauges. The coolant temperature gauge can go into the red for no obvious reason and cause alarm. Switch off the engine and restart to check the gauge goes back to normal, but reckon on fitting a new thermostat or switch to cure the problem. As for the fuel gauge, it may tell you there is still fuel in the tank when you are about to run out. If this happens, you will need a new fuel sensor to sort the fault.
M5, but now it's not worth paying any extra for as the satellite navigation is clunky and outdated by modern standards. Also, the BMW Individual audio system is not worth paying more for as its sound quality is little improved over the standard stereo set-up. What is worth having the through load folding rear seats if you intend to use your M5 as a practical everyday car.
Don't be put off by a car with an aftermarket sat-nav screen as many owners have improved on the original pre-facelift screen. Also, worn gear lever and handbrake covers on pre-facelift cars are common and not necessarily a sign of abuse.
All M5s have leather upholstery, while an Alcantara headlining was an option for pre-facelift cars and standard on post-facelift models. BMW offered the option of Comfort Seats for the M5, but few owners bothered to swap from the already very comfortable and supportive standard sports seats.
As with any car of this age and specification, make sure the air conditioning blows icy cold, the electric windows and central locking work, and all of the remote locking keys are present and functional.
"In the end, a few niggles came to the fore. The pixels on the dashboard display were starting to drop out and the auto-dim rear-view mirror went. I had probably had the best years out of the car but I was still very sorry to see it go."