In a car or truck without the aid of block heaters, etc and setting overnight.
In the 60' and 70's I lived in Maine and the coldest was -32F. My 68 Ford Fairlane 6 cyl barely cranked over but started. However the heater was woefully inadequate at those temps. Oil I used at the time was Valvoline straight 20. Later in 1977 I had a 77 Chevy with the 305 V8. Started it at -18-22F and the engine again would strain to start and when it did the entire valve train clattered terribly. Oil used at that time was Valvoline 10-40.
What say you?
In the 60' and 70's I lived in Maine and the coldest was -32F. My 68 Ford Fairlane 6 cyl barely cranked over but started. However the heater was woefully inadequate at those temps. Oil I used at the time was Valvoline straight 20. Later in 1977 I had a 77 Chevy with the 305 V8. Started it at -18-22F and the engine again would strain to start and when it did the entire valve train clattered terribly. Oil used at that time was Valvoline 10-40.
What say you?