Oh yea. I checked the oil about a week and a half prior to this and it seemed a normal color and consistency. When we drained the pan it was black as coal and ran like water. I would assume there's no sludge left in that motor. It must have swelled the valve seals up some we don't even get a puff of blue smoke any more when we start it up after it's been sitting all night.
Szlachta