Why Should Drivers in the Gainesville, Chantilly and Centreville Areas Choose Sheehy Nissan of Manassas? Of course, there are many reasons, but perhaps the most important is the incredible service we offer. From taking our time to ensure our customers have the best car buying experience when choosing a new Nissan model, to making sure each of our clients obtain the car loan and Nissan lease that he/she is most comfortable with, our commitment to you is unsurpassed. From the latest selection of new Nissan models, to our incredible variety of used cars here in Manassas, Sheehy Nissan of Manassas likely has a model that will perfectly suit your personal style.