So I went to top off the oil yesterday on my 2002 3.0 and found I didn't have any M1 5W-30 left. OK, I'll pick some up at the 'Zone today and get her up to full.
My son drove to Prom last night and this morning I noticed a SES light -- scanned out as a P0171 and P0174, so maybe there is an intake leak. Got home to add the oil I bought and...

No oil cap.

Fortunately it was still on top of the intake runners, so I added my quart and re-installed said cap.

Morals of the story:
1. Keep some M1 5W-30 on hand with a car that burns it
2. Don't get interrupted.
3. Don't be a dipsh!t!

Bill