Lasturbo, I don't think any of us Average Joes know FOR SURE what causes the oil burning. If I'm reading the chart that Mark posted properly, the Trooper got the 3.5 liter Reference Code "B" engine in mid-2001 but the VX never got the "B" engine with the updated pistons/rings - or whatever the mods were. So the wide variations in oil burning we see on this forum aren't due to design.

Bottom line is too much oil is getting past either the rings or the valve seals (maybe both!) or getting sucked in with the intake charge (.i.e. through PCV) those are the only ways for oil to enter the combustion chamber. Don't blame the nasty EGR - it's role is after the combustion process - so EGR woes are a result of oil burning not the cause.

Somebody correct this if I'm wrong but from what I can gather, the most popular explanation is lack of oil-drainback holes in the piston. If that's the case anything you can do to keep those holes clear and to keep the oil rings clean and free will help the situation. You might want to try using Rotella T 15W-40 oil which is made for diesels so it's high in detergents. And just in case there's something to the PCV theory (which has always confused me because it seems if you have a clogged PCV valve there would be less crankcase vapor/oil consumed, not more) you should make sure your PCV valve rattles every time you change the oil.