i have been useing mobil 1 oil filters since my first oil change without issues. (running 5w-20 pp.)i have one filter remaining. i am becomming more and more concerned about installing the oem filter as per the hyundai tsb.are there any members that have run after market filters that had any issues? i really dont think that the oem filters are that efficient.i think hyundai is more concerned about flow rates.please advise.