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The Premium Blue is not synthetic but it is really good oil. The Premium Blue Extreme is the Valvoline synthetic and that is also very good oil. I used the Premium Blue for a lot of miles and switched to the Extreme and really like that better. Don't think you can go wrong with either of the two Valvoline's mentioned.
I have never used Rotella (?), but a lot of people use it and speak highly of it. I think you will get strong suggestions on both oils, but the key is your oil changes regardless of which one you choose.
Search the forum and you will find data on both oils. Good luck...
2001, 2500 Ext Cab, Banks Exhaust, 4.10 gears, Auto, BAHF, Puke Bottle mod (mopar1973mans), Airdog 150, 3rd Gen wheels & upgraded front brakes, Chevy rear wheel cylinder, DSS Steering brace & 3rd Gen adj track bar, 6 Bilsteins, HX-35.
If you REALLY REALLY want to run PBE 5W40 cause it will give you that warm and fuzzy feeling then any Cummins shop, in my case Cummins Northeast, will have it. But other then Rotella's slight smell there really isn't much of a difference.
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