Diesel Oil.....
2006 Cummins 5.9 - 150k miles. I know nothing about this 5.9 that I just bought, except it really runs good. I've always used Delo 400 in diesel engines, what do you prefer and why? Thanks
Forum Discussion
I use Delo 400 in my 5.9, buy it on special at Costco. However, I change my oil at smaller intervals than most as the process is simple and relatively inexpensive. I may be wrong, but in my mind, clean dino oil may be better for my engine than dirty synthetic oil. If I had a bypass filter, I would run synthetic with longer intervals. Since my truck has low miles, I can't say anything quantitatively about longevity.
