I ran rotella in my F250, 5 gallons each oil change. Costs me couple hundred bucks to change oil, filter and small fuel filter every oil change. Cool thing, the harder you work the diesel, the less often you need to change oil. Working the old girl keeps the soot from building up. I may switch to rotella on my next VX oil change, in like 8 months! only put a few hundred miles a month on the VX