Cracked block and or heads/head gaskets are very uncommon which is why I'm trying to diagnose if you do a bunch of little trips and never get it up to temp.
Fall/winter is perfect for some condensation in the motor. Which can cause what you see. The correct test to see if you have water in the oil is to look at the dipstick as it gives you a real look at the oil. I've seen many people misdiagnose by looking at a little condensation on the cap or valves. Please tray this.. start the car.. let it run for a few minutes.. then check the oil immedicately and take a picture. Also take a picture of the valves with the goop on them.
