indycecil said:
Well I just did the most expensive oil chage I have ever seen.

Now my question is how many mile before next oil change. 3500 miles seems like an awful short period seeing as how I put 4 gallons of oil in.
Rotell SAE 30 with Fram filter
Remeber I a new with the diesel thing. Am not new to wrenching though.
Rotalla 15w-40 is what I use. It works great.
I do 5000 mile intervals. My recommendation is that you keep samples of your old oil (AS it comes out of the truck, not from teh oil pan on the floor, it has too many contaminants) and send it in to Blackstone labs to get it analyzed. This will tell you what your recommended intervals should be.
I've been fine at 5,000 miles, my oil is so nice after 5K it is almost a shame to change it and throw it out. I have even considered recycling it in my lawnmower, but it was too much effort for 2 bucks in oil. SO, I just burn it in the old waste oil heater and call it good.
Also, with the FRAM filter, be careful and pay attention for the first 500 miles or so... I've had the roll seams at the top fail on two fram filters. Dumped LOTS of oil really quickly. I like Napa Gold and Motorcraft just because of my two Fram failures. Mybe just freaky abhorrations (Fram said I was tightening them too much, but I put them on and take them off with my bare hands, don't use a wrench, so I think that one is out. Besides, never had any trouble with any other filters...)