I liked what they have done with my car. They showed me and explained what the blockage was and some other items that needed to be attended to when I can get to them to increase longevity of my vehicle and the engine. My car is a used car, but my reference to this shop from Autoplus Brake& Muffler, and a Mr. D. Dillenger. Through their imput and refences my carcare should be done well. Thankks, D Tomczak