I know this forum goes back a ways and has been the subject of some very interesting conversation to say the least, bacon anyone? I'm new to the game and bought my LML knowing about the CP4 issues to an extent. There are many LML's running around my town, and its nothing I've ever heard of casually, but my brother in law works for a local diesel shop, and he says they do many CP3 conversions a year, so we are going to eventually do one on mine (2012 2500 w/ 56K miles).
I'm nervous about my truck just a little bit. It doesn't surprise me that many people get 200K plus on the pumps without an issue. They likely drive the truck hundreds of miles weekly, fill up weekly and do solid regular maintenance. On the flip side, my truck has not been a daily driver previously, and wont be for me either. Its got a fraction of the miles of a typical truck in 8+ years. I'm the third owner and I know the 2nd owner. Adult owned and maintained (I know the owner of the shop where he did the maintenance). So running quality fuel, additives (I picked up some stanadyne high lubricity formula last night) and keeping the filters changed regularly are important. Unfortunately that doesn't guarantee the pump wont grenade and cause $10K in damage.
Hopefully, the truck lasts me forever. It sounds like for the most part these trucks are amazing, and the L5P's have been borderline nightmarish. I intend to maintain it meticulously, use quality fuel and filters and fuel additives.