Dave & Joel,
Thanks for the welcome, and thoughts on oil change intervals.

I did forget to mention in my original post that I do know where my oil is going. It is being burned. A couple weeks ago my father-in-law was behind the Rodeo when I started it. He ask if I was burning oil, the exhaust had blue smoke in it. It wasn't enough that could be seen from inside the vehicle, and it shortly disipated and cleared. It only makes sense that it is being burned if you know you don't have any leaks.

Thanks again! I'll probably be posting a question or two later on since I'm having difficulity locating some parts.
Rich