My husband had an oops that costs us $2500.
About 6 months after we got my first Mercedes (now daughter's car), he had extra gas in a gas can at home. He routinely put the extra gas in his company car (Jeep Cherokee) at the time. He failed to realize that you can't put any type of leftover gas in a high end car.
Well, I got up, took daughter to school and by the time I got home, my car was dead and would not move. Hubby had already left to make sales calls for the day. I called the dealer, got it towed and a few hours later, we were asked about what was put in the gas tank.
NOW we know that our cars are super sensitive and you never, ever use anything but the highest premium gas in them. Mercedes had to remove my fuel tank and clean out all of the lines. Of course this was not under warranty because hubby caused the issue!
It was an expensive lesson and it has never happened again. For all the years I was training daughter about driving, etc, I stressed that she has to use a specific gas or she'll be stranded!
We love our cars and will not drive another brand but we also know they are sensitive.