I have a 2013 Limited and a 2014 Limited, both with the 5.4 engines and I change my oil every 5k miles. The 2013 is my wife's and I have the 2014. Her's is all stock and my has the leveling kit and cold air intake. The 2013 has 162,531 miles and the 2014 has 160,125 miles with no oil leaks and...