Timely topic: I have been considering a similar solution to cold weather flying and engine temps. I fly year-round in the Colorado high country and use the blockage method. Air temps are often in the single digits in the valley and inverted at altitude, or vise versa. Makes it very difficult to maintain consistent, and proper, oil temps and CHTs.

Very curious what type of thermostats are working for both oil and coolant. Thanks in advance for any details willing to share.