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You might find some(most?) of it in the throttle body area--a common problem for our Gen IIs. As J said, if it's not coming from the rear, right head gasket, I wouldn't be worried.
I change my oil every 2,500 miles and have noticed I need to add a half a quart or so in between. Considering how I run the truck, , that ain't bad! Now I have about 19K on my '99L.