Great catch, you are exactly correct… the weather had been rainy and cold, and the first halfway decent day (no rain, but cold temp), I took the car to get the oil changed at the dealer (15 minutes away) … to get the water temp to 185, and oil up into the mid triple digits, I had to let it idle longer than normal so warmed up, about 15 to 20 minutes.
On top of that, the road was cold (and Michelin Pilot Sport tires are a summer tire not at all a cold weather tire, not sticky when cold), so the car didn’t get hard driving to help it warm up and burn any fuel out of the oil.
Again, great catch, and thank you for everything.