The Hyundai techs. When swapping out the engines, they put a little more oil in than recommended. That's not to say that all Hyundai techs do it. It's the tech's dealer, whom I talked to. They're not even allowed to strip down the engines. Bad engines are boxed up and shipped away. After doing it a while, they narrowed it down to bad non-oem filters and desiring more oil.Who is adding a little extra oil?