With respect to Mike's reply, He runs a badass truck that requires things to be right or else. Changing is good if not great, I on the other hand have been using the same ole head bolts since '87. Your safer to change them if you have mixed them up in a bolt tray. If your not going to change them, by all means do not mix them up. Same bolt, same hole, hmmmm that sounded a little erotic for some reason.

When you pull the head, be prepared for the worst. Sounds like a blown head gasket by the way you explained the oil and 15psi is awfully low to be just a simple fix. Check your head in between valves for cracks, (hairline).

We also do not think your dumb ever. Don't get the wrong idea, we are all here to help not to think anyone is dumb or noob. We all were in your position at one time or another, that's why we are here.