Hey; be very, very careful when it comes to changing your own Kia oil and filter. The replacement filters listed in Wal Mart stores and Advance Auto parts stores are incorrect for the Kia Sophia and probably many other Kia models as well. The replacement filters are much too short and the end of the oil shaft actually gets sealed off when the filter is screwed in tightly. This results in NO oil being circulated via the pump to the rest of the engine. However the oil pressure light will not come on and you will have no indication of the problem until it is too late. My engine just blew a rod only two days after changing the oil. At first my mechanic thought it was a failed oil pump but we quickly verified that the pump was pumping fine. When we removed the filter, it contained no oil except for a round dot of oil where the shaft sealed up against the inside of the filter.