Thanks, coolant temps were rock steady at 80C so that setup should have been warming the transmission oil.

However if the thermostat rarely opens, then the radiator itself is going to be pretty cold under those freezing wind conditions. So maybe I should put on the winter front to keep it warm.

I cut a piece of bubble foil to make a winter front last year and keep it in the trunk, but I haven't been using it this year as it's annoying on warm days (around freezing) to have to pull over and remove it. If I didn't pay attention and the aux fans kicked on, they would not like it at all.

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1993 300D 2.5L Turbo