Jestal, A question for you, since we are covering everything about oil here.
A few years ago, my wife had a Lexus RX-300. She had a problem, that Toyota knew exisited, and subsequently warranteed for, called oil "gelling".
Early on, the oil light would come on, I would add oil, then it would come on a few months later. When we brought it in for service with the issue, they said that this particular motor had a possibility of this happening.
Now, my wife wasn't exactly "on it" with respect to getting regular oil changes, but I don't think she went any more that 8k on that particular interval.
What the hell is gelling?
-BD