1992 300D.

My notation
D: distance between min and max mark on the stick.

It was about 16 degrees F outside.

According to manual, I run the engine about 2 minutes with gear at P, and then check the transmission fluid level.

I drove about 3 minutes at low speed (20MPH or less).
Then I parked and checked the level.
The tranny fluid level was about half D below min.

Then I drove highway about an hour, parked and checked the level.
The coolant temperature gaugue was a little above 80 degrees C.
The tranny fluid level was about one D above max.

How do you check tranny fluid level in winter?