I don't thinks its a grey market car....if you look at the outside temp display on the dash it reads Farenheit...grey market would be in Centigrade I think.......as for the tires they may be somewhat larger than stock....but it doesn't really look that abnormal...I would however look carefully at the paint,it appears to way to glossy for those many miles with no rocks chips that I can see....but hey for $4000.00 on a car with 313K what would you expect?
Warren
1992 300SD
Columbus Ohio