Without trying to toot my own horn, I know a lot about cars. I understand how most items on a car function and how they fail. I know the difference between a 6 ply tire and a bias-ply tire; I can talk about the pros and cons of direct injection; I can argue in favor or against anti-lock braking systems, etc. This knowledge frequently causes frustration when I take my vehicle in for basic services like an LOF (lube, oil, and filter), tire rotations, etc. and I’m “pitched” an unnecessary service item. While I know the service being pitched is...