Rotella is one of the best oils for the powerstroke (IMO) alot of guys on here swear by it. (i do) i run it in both my 7.3's. now about that filter you have you need to diych that puppy quick. K&N is knowwn to let some particles through, which will cause dusting of your turbo (not good). i just went back to paper filters by napa cause they are safe. but if i am not mistaking you need to pick up an air raid filter to replace your K&N it will go right on you K&N intake.