Try a heavier weight oil.
I use Mobil 1 10w30, changed around 3,000 to 3500 miles, and my Exp (5.0 w 118,000 miles) doesn't use any oil (as far as I can tell, anyway).
I didn't think the recommended oil was a zero weight, and you may be using something that is too thin, and more easily gets past bearings/seals/rings.