eldawg4100,
I know how you feel! I went thru the same "sleepless nights" when I was thrashing over the decision myself. At the time, I was changing dino oil in 2 cars every 3k miles, so I was changing oil every 4-6 wks. At first I wanted to switch simply to spend less time changing oil (& to cut down on used oil), but I was struggling with the cost difference. Then I started to learn that most premium synthetics are in better condition after 10k miles than most dinos are after 2k. It took me about 6 mos of reading everything I could find (& mental ping-pong) before I made a decision.
Based on what I learned at that time (about 3 yrs ago), I started running full syn oil for 10k mile intervals. What I continue to learn here simply reinforces my decision. I don't save any money over buying dino oil, but
1) I'm getting BETTER engine protection
2) I'm spending LESS time changing oil
3) I'm creating LESS waste
4) I don't have to REMEMBER when I last changed the oil in either car
Considering your choices, it's hard to justify giving up free oil. I'm assuming you're changing it so frequently because you want better protection (not because you like changing oil). I fully believe the M1 10W-30 will be providing better protection at 10k miles than your dino choices will be after 2k miles. If you don't feel comfortable going that long, change your oil filter at 5k miles. Besides getting a fresh filter you'll add at least 1/2 qt of new oil, & that will give additional boost to your protection.