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 Valvoline semi synthetic in everything. Heavy equipment to high mileage gas pickups. I buy it 300 gallons at a time, get a great price and offers good cold start capability without the higher cost of full synthetic.
