for some reason I was under the impression the owners book said 3k-7k intervals on our 6.0. Not sure where I got that idea from, but I looked at my diesel supplement book the other day before work (6am & bored) and it said 1,000 miles of break in, and 5k-7,500 change intervals. I could of swore the book said 10,000 break in, and 3k-7,500k OCI! man I was on the wrong page lol.
Well I drive 35 miles 1 way to work, through the city (not realy bad) and out in the country at 65 or 55 for half of it. so I think I'm going to do 5k-6K OCI intervals. Have any of you guys had issues with doing 5-6k Oci's? I've done oil changes @ 1,200 mi and at 3,822 mi so far. Currently the truck has 6,300ish and the oil is looking good still.