Virtually no car that has been built in the last 20 would last 40 years on the road , seeing as how manufacurers pull spares off sale after 10-15 years. What with all the electronics in modern cars , plus the fact that dash warning lights are now MOT fail terriitory , I doubt anything would last. maybe if youre already about 70 you could make a car last 10 years or so. Best bet would be an MGB GT , Mini or 68-73 torsion bar flat screen Beetle , because virtually everything for those is still made.