I'm up for my first oil change, I'm planning on using Valvoline Premium Blue, but wouldn't mind being consistent with what's in there now.
In other words, if synthetic is from the factory, I'd probably use Premium Blue Extreme 5W-40, otherwise I might just use conventional Premium Blue 15W-40.

I've read more threads then I care to remember about other brands, not the point of my question. Just wondering what is in the factory engine.

Thanks!

-John

 

My 06 CDT had 12 quarts of Valvoline Premium Blue 15 - 40W Heavy Duty Diesel in her.