Powerstroke CP4

depends, if you live in the USA then a desaster prevention kit most definatly, I would do a new pump when the pump actualy packs it in and you need to get one.  in the mean time a good additive like archoil AR6500 will give you the lubracation and cetane USA diesel lacks. As for the DCR it is still new, I believe it was introduced about 2 or 3 years ago and there is not enough data for me to be able to recomend if it is the way to go.   also the year of your CP4 makes a big difference.  there are 4 or 5 generations of it out and each one better than the previous.  since you were talking about the dcr replacment I am assuming you have a 6.7 powerstroke, but the year will tell you which generation of cp4 you have

the issue isn't the pump its self, but the diesel we use in north america, perticulary in the USA.  in Europe they have a less than 1% failure rate, in the USA that is up around 8 or 9% and in Canada it is back down around 1%.   the reason is the lubricity standards in european fuel, the USA didn't follow the same levels and hence is wearing out more pumps.  Canada did follow the european specs for lubracation.  I am in Canada and I still run a lubracation additive, make sure its a good one, most are not good at all, if Ican find the testing videos again I will post them for you.  the other issue both USA and Canada have is wedidn't follow the cetane requirments of their deisel also, hence we don't get the fuel milage they do.  so I add a bit of that back also.