ahhh... but if you bought a used Ford Bronco, you would expect any mechanic to be able to work on it, and expect any mechanic to buy parts from Ford to do so. That is not the situation with watches - it is legally identical, but with Rolex the equivalent is - no one but Ford dealerships can buy parts - any non-Ford part in your Ford causes it to no longer be a Ford in Ford's eyes - Ford will refuse to work on anything but Fords In other words, buy windshield wipers at Autozone and and the minute you need an engine part, your Bronco is spare parts. This analogy was made fresh this morning by the managing director of Cousins UK. By the way, your Ford dealer would be delighted to work on your tricked-out Bronco. They just won't honor a warranty that's been voided. Since most of the "Broncos" we're discussing here are years and/or decades out of warranty it's a moot point.