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D-Roc, Thanks! I'm going to go with the Valvoline Premium Blue Extreme Synthetic 5W-40 for now. I am doing all my own PM, and Dodge loves to try and find a reason to void your warranty. Using the Cummins approved oil and change interval for the 100k mile engine warranty will give them one less...

I have a 2006 Dodge Ram Cummins Turbo Diesel. I will be turning 20k miles soon. When I do I plan on changing to synthetic oil. I have been using the (conventional) Valvoline Premium Blue 15w40. This is the conventional oil that Cummins recommends for my motor. The synthetic that Cummins...