Okay we have had ours just over a month and have 3k miles logged already. Just too much fun! We have an 2011 superduty with the 6.2 gas burner and I have always used Mobil 1 ep 5-20. and change it every 10k miles. So this I my first choice in oil. The oil is rated for 15k miles but can only find filters rated for 10k miles service, so 10k is. 7qts and fram extraguard filter $55 makes this economical. What is everyone using for oil in their rides? and why? and Thanks in advance.