After performing a diy oil change on the Santa Fe, i took the Sonata for one of its "free oil changes and tire rotation." I brought my own oil (GTX) and from where i stand, can see them pouring it in. What i didn't know is that along with Hyindai filters, they also use a brand owned by Pennzoil, Performax oil filters. It was explained that they meet OE quality and because Hyundai and Shell have an agreement to use QState oil as dealer fill, more dealerships will also get Performax filters...some branded as Pennzoil or Quaker State as well as the brand name, Performax. They used PO-37 in my Sonata. No rattle or noise. Seems to work just fine. I've seen some older threads where this filter was cut open...seems pretty decent for a 5K mile oci. Do you have any experience with them?