Today's temp here is currently -17F, the high for the day. After parking at work I sat to watch the oil and water temps as I was curious as to the heat dissipation rate at idle. When at idle, my oil was dropping in temp (from a high of about 160F) roughly 4 degrees per minute, and the coolant was dropping nearly 10 degrees per minute. On days like this the thermostat never opens. Mind you, this is on a 2.0L EA888, so small displacement and the coolant is routed through the integrated exhaust manifold for efficient warm-up. Yes, I will start it and let it warm up for 15 minutest today before I leave...anyone that says otherwise and is in the "just get in and drive" camp has never sat on -17 degree leather. The joys of the North!