My wife filled her car's gas tank at a station that also provides auto repair service.
After driving a few miles, the car's engine started to run poorly, the engine service light turned on, and it had barely enough power to make it to the side of the road.
She called the dealer we bought the car from, and they warned her to not run the car further since it would ruin the engine. A couple days later, they towed the car, found water in the gas line and tank, and repaired it.
When we demanded that the owners of the original gas station compensate us for the tow and repairs, they replied that we were required to return to them for the repairs, not to the dealer.
Does buying gas imply a warranty on it (they mentioned "warranty" in one of their emails)? Were we legally obligated to return to the gas/service station for the repair?