Synthetic oil for my '86 6.9 Turbo diesel?
 

Well... I'm going to be changing my oil fairly soon, and I want to go synthetic... partly because of the extreme cold in Minnesota, and partly because I don't run natural oil in anything except my Jeep. (If you saw it, you'd understand the exception XD) Anywho, I saw a big jug of Shell Rotella T6 at Walmart, 5w40 Full synthetic I was originally considering, especially at only $20/gal. However, reading a few posts on here quickly disuaded me from using Rotella... So... What is the best synthetic to use in these trucks? I will go with the Motorcraft stuff if I have to... but they only sell it in quarts, or 55 gallon drums >_> And, I haven't priced that out yet... Also, there seems to be some debate about using a powerstroke filter as well? Why would I want to do so over a good quality OEM-style filter, such as WIX, or K&N? Thanks!

i run:
Mobil 1 Fully Synthetic Turbo Diesel Truck 5W-40 Oil w/ Mobil 1 M1-601 (94-97 psd) Synthetic Fiber Extended Oil Filter

Just regular Mobil 1 Full synthetic? Hell, I sell that at work, and get a 10% discount :D

Ooooohhh, yeah, that's obvious now that I look at it, I assumed you were specifying you had a turbo diesel truck... Gotcha! And thanks!

yeah,figured i better make sure you didn't think i was running an oil not meant for diesel applications.:)

my truck has always had shell rotella T run in it. 370,000 trouble free miles later, im convinced it must be some good oil

I was in Walmart picking up some oil for an oil change and they had Rotella synthetic blend on sale for the same price as the regular stuff. So I said why not it has to be a little better than regular rotella or Delo. Boy was I wrong. When I'm pulling hard it sounds like the valves start rattling. I'm going to run it long enough to get it good and dirty and change my oil again.

OR just a good engine!!!