Is there a preferred oil for the Ford V10 E-450?

Friends don’t let friends run K&N filters. Not as bad since it’s naturally aspirated, and “ok” if you actually maintain them right, but otherwise wholly a waste of money with a much higher potential for ingesting dirt.

And again, just find some 5-20 or 5-30 syn oil. And use it. Brand doesn’t matter. Service interval does.