This would assume the truck is moving 100% of the time it is running. Which is impossible

 

If the Engine is running it is working so I would figure that into the average even if it's not moving.
(On the driveline you are correct).

 

I had a problem like this in my '99 Superduty V10. Mine was because of a defective PCV valve. Replaced it with an aftermarket PCV valve and the problem continued. Replaced that with OEM Motorcraft PCV and problem went away.

 

That is a good idea, I will check that out.

 

You could have a sticky ring; had that same symptom a few years back w/ another engine, no evidence of leaks, started dropping a quart/ week for 2-3 weeks; ADDED some MMO (Marvel Mystery Oil) in it, and after a week went back to 3,000/QT. Been working Ok now for several years, and I occasionally add a 8-32-oz of MMO for giggles/ grins.

 

I'll have to give this a try , the MMO. Tried flushing with Seafoam. May need another hit with MMO .

 

TIP: Additionally, MMO was tested against Seafoam (as seen on Youtube recently), and did a much better job of removing piston carbon, at a much, much lower cost. (Admittedly, I have been a MMO user/ convert for 50+ years :-)

 

In my particular case I am strongly suspecting the PCV valve. It was between -15°/-20° and drove the truck 1 mile to the farm and never really worked it enough to really warm anything up and let it idle for hours.

My current theory is that the PCV valve froze or gummed up in the open position and prolonged idling let it suck oil? Hasn’t seemed to be an issue since it warmed up?

 

You would think if that's the case it would've been smoking like a mosquito fogger.

 

With it that cold the exhaust never quit steaming, it’s possible I could have missed that? Never smelled oil though?

 

If memory serves me right in order to replace the PCV on the 3V you need to buy the entire valve cover assembly. The PCV valve is built into the valve cover. Make sure you go over all the hoses to check for cracks or breaks.

 

Now, to be polite, THAT would seriously torque my jaw.... glad I have the 2v