I learned of the Bosch CP4 pump issue after I bought my new 3500 Duelly Cummins High Output and immediately took proactive measures to keep the fuel fresh & increase lubricity. A Ram/ Cummins Tech friend recommended Lucas Cetane Power Booster and Diesel StaBil. I use the Power Booster at 1:128 (an ounce per gallon) and one ounce of StaBil per 10 gallons. I also, religiously, never let the fuel tank get below 3/4 full. The Service Manager at Larry H Miller Ram confirmed what I am doing is preventive medicine. The Lucas product adds much needed additional lubricity to the fuel and always keeping the tank full, with the added StaBil is preventing oxidation and condensation (water).