VIN doesn't hold up. Look at GM, GMC, Chevrolet, Pontiac, Buick, Cadilac, Oldsmobile, Hummer, Caterpillar, Daewoo, Opel, Isuzu, Saab, Holden, Vauxhall, Bedford and probably a half dozen more I can't think of at the moment. They are all GM but one CEO who happens to be a woman named Mary Teresa...