I'd use oil analysis before guessing, otherwise stick to OEM @ 200 hr intervals. I understand the 6.0 shears the additive pkg to almost 30 wt fairly quickly. If u live in cold climate, syn will give quicker starts. OTR trucks been using dino juice for a very long time with good results. ymmv

good oil info here: http://www.bobistheoilguy.com DIsclaimer: am not affiliated with or employed by the preceeding.

I agree, oil analysis wont lie.

Rotella T5 10w 30. NUFF SAID

I work in the oilfield in west texas as a drilling consultant. 300 to 600 miles a day between drilling locations. :tttt:

Do you know what was ran through it before?
if it was junk oil and all of a sudden you switch to high detergent like Delo 400 or Rotella or even a SYN you may have some problems in your HOPS and small orifices due to the new oil removing all the left behind crap

Im not sure what was run in it. The truck was maintained very well from the looks of everything and with the way it runs and drives. I changed my oil for the fourth time yesterday since i bought it. I put the oem oil filter and put rotella t6 oil in. I've put about 500 miles on it and it seems like its running fine. Only difference im noticing is that it starts quicker. But my truck never cools down completely before im driving off again.

You'll like the T6, your truck will too.

true story
 

When I got my truck I was quick to get the filters andoil changer. I went to a place that does quick lube I didmt know what to ask and my truck afas had no low end prower once its started. I just had a change done and with motorcraft filters and Rottela oil. I was having many qurky problems and now they have all bu stopper

My advice is to go with what these guy on here this board.



Chris