Rick Frazier wrote:

> A blown head
> gasket can either be the cause or result of running under this
condition...

Update: They are replacing the head gasket tomorrow.

Thanks guys! (at least one person replied privately and nailed
it too!) I never would have thought that would have been it.
I told the service writer this morning, and they eventually
concurred. Fortunately, since I just bought it, they are
covering the cost! Phew! Let's hope that ends it for good!

Thanks, John