I love the auto care club card. I took my car in for a tire rotation and paid nothing. The oil changes themselves make the card worth it, but the two free tire rotations plus two free state inspections.
Plus the honesty and integrity of master mechanic and that they never push you for service. They tell you what you need and remind you on your print out, but aren't pushy about it. Definitely won't find much better in the Chantilly area.