“Values have more than doubled in the past two years,” says Jon Mitchell (01202 488800; jmgporsche.co.uk). “The 944 turbo is now £15-25,000, but the 968 Club Sport [£20-30k] and 924 Carrera GT [£40-60k] are increasingly in demand. The 924 turbo [£5-12,000] is rare, so potentially a good investment.
“Porsches wear mileages well, so a car with 300,000 miles can drive as nicely as one with 30,000; anything with less than 100,000 is really low-mileage. Originality and history are important. Ensure the cam and balance-shaft belts are changed every four years, and the water pump, engine front oil seals and belt-tensioner rollers [c£1800] every eight. Clutches can be expensive and typically last 45,000 miles.
“The history should show the car has been serviced every year, regardless of miles, and turbos should…