Valvoline Premium Blue 15w40

[Copperhead]

I use another brand of oil, so not wanting a brand war. Just information. My Cummins manual recommends the Valvoline Premium Blue and, recently, was in for some warranty work and noticed that Cummins is really pushing using the stuff. I realize that Cummins and Ashland Oil (the producer of Valvoline) are somewhat in bed with each other, but curiosity has gotten the better of me and I am wondering how good this oil is and how it stacks up against the other leading brands. Also, I checked with my local tire and oil supply dealer and he will sell the Valvoline PB 15w40 to me for around $10 a gallon. Price didn't seem too bad, so it caused me to start doing a little research, but not much on forums to go on. This also is the only oil that Cummins recommends for extended oil changes and will allow a 5000 mile increased oil change interval over their normal recommended interval. Must be something good about the stuff. Comments appreciated.

[heavyhaulerss]

This also is the only oil that Cummins recommends for extended oil changes and will allow a 5000 mile increased oil change interval over their normal recommended interval. Must be something good about the stuff. Comments appreciated.[/quote]

I am always concerned on what the mfg recommends. I think mfg's would love for every one to need to buy new equip sooner & not have parts last long. just like o.e.m. parts. imo oem parts are inferior to other replacement parts. I know nothing about the oil you are talking about, but I bet if you go over the mileage as cummins say you can with this oil & your truck has future problems because of it. cummins will not be responsible for it. they would rather you buy another engine.