Low oil pressure

Goldduster, throwing an example of high mileage engine running synthetic is not what we were discussing nor are RARE examples relevant.

"A co-worker has a 2004 Honda Accord 2.4L. 411k miles and has run 5w30 Mobil 1 since new. It has NEVER been apart. Still runs very well."

" Personally, I'd like to see at least 20psi at idle, but a good first step is to dump the fram, change the oil, inspect to see if there is any metal coming out and see what happens if there isnt"
Is that not what I suggested? I also said to use a heavy oil to help diagnose a potential problem.

I had a 1973 K5 blazer 350 with 275K on it, do you expect your Colorado to get that far?