My dealership advised me to bring my new 3S back for service every six months regardless of mileage, however Mazda's first recommended service interval is 7500 miles. I've had the car for six months now but only have 1200 miles on it. Has anyone had the experience where their dealership claimed that they voided the warranty by not having their 3 serviced according to their dealership's recommended schedule, and not Mazda's own? Just curious. TIA.