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Mine is normally only driven on the weekends as well. So long as you work the truck when you drive it I dont think thats an issue. If it sat for weeks at a time I would be more concerned.
ditto with the above, as long as you run it and hard you should be good. Mine was kinda getting slugish so I hooked up to my TT and took at hill of I guess 6% and put to the floor. runs better now.
If we could run our 6.4's 50,000 miles a year, under load, do proper fluid changes, they would last way past our warranties. Alas, we do not. If you know an over the road owner-operator of a truck tractor, ask the same question and see what you get for an answer. It will surprise you.\