I have a 2011 Kia Sportage with the 2.4L multi port injection engine that has 234K miles on it. It does not burn or even leak any oil between oil change intervals. I replaced the alternator yesterday and that was the first engine component to fail. I have adhered to a 4K mile interval oil change and used various "full" synthetic oils. The filters also were varied. I have settled on Wix oil filters now however and buy whatever "full" synthetic that is on discount. I pay between 15 and 20 dollars for a 5 quart jug. i have used Amazon, Mobil 1, Castrol Edge, Napa, and Wal-Mart oil over the years. I am trying now to better understand if i should switch from the 5W-20 i have used all this time to 5W-30. I read with interest all the posters here who have a wealth of knowledge about motor oil. In my earlier years - i was always tinkering with the better mousetrap idea - age has taught me to dance with the girl i brung...