What would make my 2001 7.3 powerstroke put motor oil in the fuel filter housing? If I fill it up with fuel it wont use oil until it gets below a quarter tank. When it's below a quarter tank it will go through about a gallon of oil in around 5 mile.

 

Injector O rings?

 

This!

 

I tried that it didnt help.

 

The only way for oil to get back to your fuel filter is the orings. Other directions it can go is coolant or ground. Possibly into the cylinder through the injector but I'm not really sure on that

 

Hey my truck is doing the same thing did you figure out how to fix it?!?

 

Which filter should I choose for 7.3?