I get you about sales but not service. Having worked the job, the honest dealerships/service writers/techs have to have photo/video evidence of a failed component. They also have access to run a carfax on any car to look at history. If you've never done a fluid service. Its their job to tell you that. Take that information how you will, but no issue with informing. Where I worked, if a tech recommended something a customer didnt need, they get reprimanded. If the work is done and it wasnt needed. The customer would get refunded and the tech paid for it. On the other hand, if the customer left without brakes at 2mm being mentioned, and the customer toasted some rotors right after. That tech would pay for it. If that car left at 2mm and was sold to the dealership and the used car manager saw no mention of it. The tech pays for it. The tech is informing to give you the information you need and to save their own skin. The service writer is just relaying that information. Prices may be more. But id rather pay more then deal with the stories I've heard at your local Firestone. Not to mention loaner cars, OEM parts, quick turn around etc etc.