Future Proof BMW 5 Series E39 saloon and Touring (estate) driving pleasure is delivered by the BMW 5 Series (1996 - 2002) the last of the fixable BMWs. Tempting as it might be to live forever with an M, it is the big sixes, both diesel and petrol that deliver important future proofness. A good private 2000 528i is still £------(The prices are always changing ask the Future Proof Cars team for up to date prices and links to examples for sale).