[HummerJim]

I'm on my third H2 and have never had an oil issue except for my 2003, that I bought new. It used a little over a half quart the first 2000 miles and then never used any oil after that. My current 2006 has 45,000 miles and has never used any oil except when we head up to the cabin on those very steep dirt roads, probably splashes up on the crank - the road isn't like Moab, but it's close and the main reason I've always had Hummers. I change the oil every 3000 miles and use Valvoline Synthetic, although I used to use Mobil 1.
Afterthought
I also had a 2006 H3 that did a little better on the trail because of it's narrower width and MTR tires, however it just couldn't carry enough of my wife's "stuff" back and forth to the cabin. That I 5 never used any oil.