has any one when from dino oil to full synthetic oil & had better m p g & what oil & how much better m p g did you get ? i have 2011 chevy 2500 Duramax pulling 35 ft 5th wheel..
I have used both and have never seen a difference at all.
Now that we have the 2.0 EcoBoost in my wife’s car I probably will run Mobile 1 as I know there is a lot going on with the turbo and “stuff” like Bryan mentioned in his 1.0.
MPG will not be the main driver. I want this car to go to 200k plus.