One site I'd recomend for diesel info in particular is
www.thedeiselstop.com, they have a lot of deisel specific information, and have an entire forum devoted to the 444E Navistar IDI diesel. I personally have a 1992 F-350 with the 444e. It was burning a lot of oil at 200000, so I wound up installing a reman longblock, whic has worked out well for me so far. One thing I would ask is are you running SCA's in the coolant? If not start asap, these engines are known for having problems with cavitation. Good luck!
