I did hear that they are going to put a new 4. 1 litre Cummings V-6 in the 2008 Superduty line, they had to down size the engine due to chassis strength. It sounds like a pretty nice rig, supposedly it runs on straight 15-40 and uses ceramic piston components that precisely control crankcase vapor pressure which fuels the power cycle. Eliminating injectors/pumps and the rest. It's brilliant!
JJ
JJ