The only gas station job I had was for a week helping a buddy before I went off to the Army. Somebody in his family owned the station which was a gas station/motel/restaurant right on the Nevada/Utah border in Eley. It was across the street from the motel/restaurant which was next door to a casino. They preyed on good Utahans returning from the sins of Nevada before crossing the salt flat desert. I was taught how to pad my income by short sticking the oil and them having empty cans in the dispenser at the pumps. We'd short stick the oil, show the guy he was down a quart, then while he stayed in the car punch another hole with the nozzel and pour the empy can down the filler tube. As far as I knew nobody every got busted, we also called it "hitting them over the head" for a bad belt, hose or tire. It was the only crooked job I ever had and ain't proud of what I did, we made a point of never taking advantage of "real people", just the phonies or wealthy jerks. One of the guys would use a sharpened down screw driver to punch a hole while checking the air in a tire, tell the guy he had a slow leak, when he got out to see the guy would spit on his finger and rub it over the hole, then sell the rube a recap for twice its value. After I worked at that station I never trusted anyone to work on my own vehicles until I was well into my 40's and even now I am very suspicious of any work required by dealers and usually double check their requirements...even factory recalls.