these are what they call “job security patches” Where they break something, just so they can fix it later.
its like the shady car repair man. Put low quality oil in the car, so the customer returns 3 months later for another oil change or an entire overhaul.
#1 reason why I wont go to a garage for an oil change. better luck with John Deere oil than Pennzoil, mobil or especially vavoline. (stuff turns to water in a month).