Just bought a 2015. Didn't own the 2012 long enough to learn much about the 6.7. On the 2015 6.7 do you need to clean the EGR. Noticed that Genos has a cleaning kit for the EGR on 07.5-2012. Not sure yet what I'm gonna have to do that is different from my 2004.5. Always gotta learn something new. Wished I could just get perfect at something OLD. lol