What brand and grade of oil is recommended? (I live in Utah where it can get down to 0 or below on some winter days)
I use Rotella 5-40 synthetic, we live in the same climate. I really like this oil, the truck sounds healthier when started cold or warm
Do I have to worry about adding an additive in the winter time? And if so, what additive?
I don't run an addative in my truck, and never have
How often should I change the oil? I see conflicting milage out there.
I do mine at 5,000 miles. Like 4x4chase said, change both fuel filters, oil and filter, and external tranny filter
What should I be aware of on the turbo?
Just be sure to drive it at least once a week, and give her some pedal every once in a while to be sure that the vanes stay free
What else should I be aware of, in general?
Watch your boost levels and EGT's especially if it has a tuner on it.
there are a bunch of good guys and gals on this site