Oil filter and sender are fine. I spent some time under there with the engine running and think I've traced it back behind the timing belt cover... I didn't pull that off because that is nearing the limits of this spark plug and oil change grade of mechanic. And it was time to feed the kids. Cam seals?

And while I was down there, I saw red stuff dripping down from the rear passenger side of the engine, up high near where the driver side exhaust crosses over. It was above the transmission, so I'm thinking coolant - smelled/felt about right - it was mingled with oil by the time it got to the bottom... Grrr.