01-07-2019, 06:48 AM
I have a 2008 F-350 that has had the oil filler blow by smoke for 400K miles now. I would check somewhere to see if the DD60 has a positive crankcase ventilation valve that needs to be replaced in the crankcase vent system. That is if oil sample results are good. It is looking like you have quite a bit of blow by. That might be fixed by an expensive in-frame or complete engine overhaul. Also might help to run a little higher viscosity oil.