Well, now that my truck has a whopping 200,000 miles on it, I'm due for my second Cummins recommended overhead. I understand the reasons for it, and have seen what happens when a Cummins never gets overheads, but I am hesitating. The reason I am hesitating is because I am getting the best fuel mileage out of my truck that I have ever gotten. I'm currently averaging 6.19 mpg, and have had some trips average over 7 mpg. It is a virtual guarantee that my mpg will drop after the overhead, and how long it will take to go back up is anyone's guess.
Part of me is saying that I need to get it done, because it is a preventative maintenance item, but another part of me is saying "If it ain't broke, don't fix it". What say you, all the CAD experts?