I only do about 5K on my 2012 Camry a year which came with the 0W20 oil. Had to argue with the dealer at the 1yr/5K mark to change the oil and filter under the free maintenance program a year ago this November. When they changed the oil they used Mobil oil not Toyota. Since I am not that comfortable going a year on an oil change I was wondering if I could use 5/30 synthetic like in my 08 Highlander every 5K without any issues. Or is there really merit not a gimmick to this 10K or 1 year Toyota oil change interval, seems like they just want to say some $$.