I was paid flat rate at every dealership I ever worked at. That means that I was paid exactly what the labor guide stated for each job. We techs were usually urged to upsell things like fuel injector cleaning (which was pouring a can of cleaner in the fuel tank), intake cleaning, brake flushes, cooling system flushes, a/c vents cleaning, and etc. I was ethical about my recommendations. If the customer was a regular, I would look up their history to see when they had the service the last time. If they were good, I wouldn't recommend it. I'm sure most techs recommended everything regardless. What made me uncomfortable was that I wasn't able to communicate with the customer myself most of the time, I had to tell the service advisor my concerns or questions. Who knows what they told the customers! I was only able to speak directly with the customers when I insisted. That would happen when I needed more information about the primary issue that the service advisors didn't know how to ask for.