The salesman at the dealership where I purchased my new car said that if I have you work on my car, it will void my warranty. Is this true?

False! Consumers are entitled to have their cars serviced wherever they choose.

Always read your warranty to understand what constitutes a covered service item. As long as detailed records are kept (as we do here for all of our customers) and the service intervals are met with Genuine parts your warranty will never be void.