This undercover KXAN investigation exposed automotive shops charging customers for the most expensive, highest quality synthetic motor oil for their cars but putting in much cheaper, lower quality conventional oil. The cost difference between full synthetic oil and conventional can be as much as $80 - $100, which means customers were getting ripped off while the auto shops were profiting. But there's really no way for a consumer to tell if they're getting the oil they paid for without having the oil tested at a petroleum lab, which is very expensive. But KXAN was willing to cover the expenses to achieve the story. We paid thousands for oil changes and lab tests to expose the problem. And after we exposed the problem the guilty auto shops stopped what they were doing.