Well then MMO you should love this… I posted a lengthy description of my experience about a month ago if you want to search for it, the update… I thought for sure I had a motor issue that was going to force me to tear it down to find the problem. Problem was that it seemed that it was down on power (hard to tell with the cummins motor unless it’s sever), I decided to run MMO in the fuel (diesel) at 1 quart per tank (approx 37 gallons) for several tanks and monitor the problem. After about the 3rd tank I noticed it started having more power and continued adding the quart for 2 more tanks. Now after tank number 5 & now on 6 (or so) with 16 oz MMO & 16 oz 2 stroke oil, the motor runs & sounds pretty close to new. Very happy with it.
As for the OP, I had a 2000 Dakota with the 4.7 motor and it too had a sludge problem. the problem however had something to do with the PVC setup IIRC and there was a TSB for it. YOu might want to check with Dodge to see if there is a TSB for your truck on it. Sludge always accumulated up by the oil fill cap on my Dak.