I've been taking my car to Tune-Up Masters (on Burnet Road) for years now for my oil changes. The guys that work there are always so friendly and quite knowledgeable. They have pointed out a couple of things that need fixing, but they don't do the repairs they point out, so they aren't trying to upsell me. They tell me as a good samaritan. It's quick and cheap and I continue to take my car back. They don't have much of a wait room -- just plastic chairs next to the cars they are working on -- but there's not much of a wait so that's ok. It gives you a chance to talk to the guys anyway.