I've got a sneaking suspicion that the head gasket in my 2001 Deville DHS may be on its way out, i.e. the head bolts are pulling out of the block as has been described. Here's what I'm seeing:
1) I have to add about a quart of oil every 1500 to 2000 miles. I know this because I change the oil every 3000 and I cant make it between oil changes without having to add some. There's no smoke from the exhaust or oil burning smell, and no sign of leakage as would be evidenced by an oil stain after leaving it parked.
2) Every now and then I get the "CHECK COOLANT LEVEL" prompt on the dash. I throw a little DEX-COOl in there and all seems well for a while.
So, with these items in mind, how do I confirm, and possibly preempt a head gasket failure? What can I do now to give myself confidence for those long road trips?