The best mechanics I've ever worked with. I squeeze every mile I can out of my cars, and Barry and company (especially Dave) helped me get 175,038 miles out of my Taurus, and they even warned me when the transmission was about to die. It actually died three days later, en route to me picking up my next car, which may be in one of those photos and is now going strong at 112,000 miles. These guys are very fair in their rates (I absolutely do not understand why people take their cars to dealers for maintenance) and their estimates are precise to within a few dollars of the final cost. They're not open on the weekends, but they have an after-hours drop, and if you need a rental, there is a rental car company just about two blocks away. Gill's is also near Dulles Crossing, so there are a lot of shopping and restaurant options in the area while one's car is being worked on. They also do state safety and emissions inspections, and I recommend that you get your oil changed at the same time, which beats sitting in line at a gas station to get only the inspections done. I've been going to Gill's for 10 years, and am really happy to have a "neighborhood mechanic". Highly recommended.