Oil pressure when cold.

When I was driving them daily I never changed the oil I used but I had some tricks... I'd park it close to whatever structure I could to limit the wind, and hang an old style incandescent trouble light under the hood if it was below 10° overnight. I also had a peice of black cardboard that I'd tuck in front of 1/2 the radiator to keep the temps up when buzzing down the highway like the heavy trucks do. It made the heater work a lot better too.