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The auxiliary automatic transmission fluid cooler comes with a thermostat bypass (I've got these on three of my 240's, because I tow my boats with them).
One thing -- about "wind chill" -- a common misconception (which I cover in my physiology lectures). In reality, it will not make your car (or any part of it, including fluids) colder than the ambient, "still-air", temperature. That is, if the still air temperature is a mere -20 deg F, that's as cold as your car will get, even with a lower wind-chill temperature of, e.g., -100 deg F.
Actually, wind chill is not a measure of temperature at all, nor of how cold an object can eventually get when exposed to it -- rather, it is only a measure of how fast an object will cool off, or in other words, a measure of a rate of cooling. Let me explain...
Being warm-blooded, with temperature above ambient, wind-chill effects are significant to the human body (and those of other terrestrial mammals). And being warm-blooded, such mammals cannot allow their tissues to cool faster than their blood can warm it, or else the tissues will die. But the numbers or scale used for wind chill is spoken of as if it was a temperature, and as a result is often misunderstood by the public.
Wind Chill was developed by a scientist, commissioned by the military, to study (and help predict) injury (e.g., frostbite) from extreme cold. The numbers that were developed in this research are actually units for comparison to still air, based on the rate of cooling of, and therefore the induction of injury to, exposed parts of the body (viz., frostbite, etc.).
What wind chill numbers ("degrees") really mean is this, literally: a given wind chill number, e.g., -100 deg F, is going to produce the same effect (i.e., the same rate of cooling, and therefore tissue damage) as when an object (or body part) is sitting in still air at that same temperature. However, the distinction is this -- if the wind chill temperature is due to a combination of warmer air temperature, e.g., -20 deg F, and some wind velocity, the object (or body tissue) exposed will indeed cool off as fast as if exposed to -100 in still air, but will *stop* cooling any further after reaching -20 deg. There, it will reach an equilibrium with its surrounding air's temperature, and cool off no further. Thus, wind chill doesn't tell us how cold an object will eventually cool to -- only how fast it will cool.
Example: An object will cool faster in a combination of wind and 20 deg air (e.g., a -100 deg wind chill) than in a combination of 20 deg air and no wind, but will not get any colder than 20 deg. ever.
Your car and it's parts, fluids, etc., not being a warm-blooded creature, is not effected by wind chill (except that your radiator will cool your coolant much faster :-). So when selecting lubricants and such, you only need to plan for the lowest ambient air temperatures, not for lowest wind chill temperatures -- your car can't suffer the effects of this, like the tissues of a mammal can, because it isn't try to rewarm them.
[Hmmm, I just thought of one exception. The passenger compartment of your car will suffer wind chill! It's trying to keep your compartment warm with your car's heater, while wind chill is causing a greater loss of cabin heat, cooling your cabin, as the air passes over the roof, sides and windows of your cabin.]
Only when a mammal is trying to counter the cooling effects of wind chill, by warming exposed tissues with warmer blood (and risking losing body heat too fast as a result) is wind chill an issue. It's not about inanimate objects.
Have fun, and happy holidays. Oh, and best of luck with your new diesel car!
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