When youâre looking for your next pre-owned vehicle, which questions are you likely to ask? At O'Fallon Interstate Motors, located in OâFallon, MO, and serving the entire OâFallon area, we understand the questions that are commonly on your mind, and our staff works tirelessly to provide answers and options that suit your lifestyle and your budget. With models from iconic import automakers such as Mercedes-Benz and BMW as well as famed stateside manufacturers such as Chevrolet, Ford and Cadillac, we at O'Fallon Interstate Motors let our models speak for themselves, while our helpful and attentive financing team works with both local lenders to find you a situation that fits your needs and budget.