If I had to live in Montana again (I remember the tank heaters, battery heaters, oil dipstick heaters and pieces of cardboard in front of the radiator) and run a Porsche there during the cold season (Aug 15th to June 15th) I think I'd just rig up an adjustable metal shutter on the bottom of the engine mounted oil cooler to make it a little less effective or recirculate some of the heater box air back into the shroud. I wonder what to do about a heater for the transmission oil though? Perhaps a mix of kereosene, Marvel Mystery oil and Swepco like they do in Alaska
Jim