I have a PJ 27+5 with dual tandem 12k axels and monster ramps. For what I use it for its perfect. Sometimes I wouldn't mind some extra space but for the most part it's perfect, I can get into most places easily with that trailer and my ccsb.
I am going to replace the heads on my truck in the next couple of weeks. I think I am going to go oem. The factory heads have 235k on them so hopefully this next set will last as long. Lol
I'm in the same boat as you with my 6.0. I have fuel in my oil also, I'm thinking my injector bodies have cracked too. My injectors are from holders, I need to send them back I just don't have time to pull them right now.