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I used to work in a Chevy dealer, still keep my ASE certifications current and used to be GM certified. Working at an extended warranty company now I see a lot of really shady stuff. In the dealer I was always honest along with most of the others, but some of the other techs, not so much. Some techs had a favorite thing they liked to upsell on every car whether it needed or not. Periodically GM would release software updates to address specific issues that a small percentage of vehicles may actually benefit from under certain conditions. One of the techs would recommend updating the software on every car that came in, charging $110, even though virtually nobody would benefit from it.
While dealers aren't always honest, the absolute worst offenders are the national chain stores that specialize in oil changes or brake work. 999 times out of 1000 if your brakes are squeaking the calipers do not need to be replaced, it just needs pads and the rotors need to be either machined or replaced. Yet these brake chains always call in stating all the calipers and wheel cylinders are failed, and if they are extra greedy they will even call in a master cylinder. Now an average, non carguy consumer may not know any better but we certainly do, and every time we send an inspector out to verify the failure they find nothing wrong.
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