[David]

My last visit to the BMW dealership when my ex-wife's warranty was about to expire went like this.

Service rep, "your brake fluid needs replacing"
Me, "really, how about you look up the last time YOU replaced it"
Rep, "Oh, it show's we just did it a couple months ago"
Me (getting louder and louder as this comes out of my mouth so everyone in the service department could hear me!), "Yeah, it shows that but that's not true because I checked the fluid when I got home that day and it wasn't changed, so you know what I did? I flushed it myself so that fluid is practically brand new. So either your service tech's lying or don't know what they're doing or you're lying!" At this point I'm looking toward the service manager who has seen me as a good customer for years. The service manager looked like he wanted to crawl in a hole. He wouldn't make eye contact with me and sure as hell didn't come over to see what I was pissed about. I walked out and never went back.