[Harris]

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Most mechanics at these places strive to get much more than 8 hours of work in an 8 hour shift if they want to make any real money. What this means is they won't invent fake work to be done, but they rush through jobs and don't take the time do it properly or to investigate any real issues that may come up while doing it.

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This isn't true. Having worked flat-rate as a mechanic before, I can say that most shops are pretty big on upselling jobs and creating more work on every vehicle. Most of the work they attempt to sell is what's known as "gravy work," or very quick, small jobs (like air filters, fuel filters, etc.). This works well for the mechanic, who can pick up several tenths of an hour in a very short amount of time, and the shop generates extra revenue.

You are correct about them rushing work out, and it does result in more errors than necessary. However, much of the work is very routine to these guys, and the mistakes tend to be limited to less experienced/competent guys.