Cold start

[rocket1]

I like to start the A periodically and in the winter on the coldest day as an ongoing experiment to see if she will start with no problem.Today it was 13 deg.F and with heavy oil it started on the first attempt.I consider that darn dependable it still has the 6 volt system my 54 Ford that I had in high school most of the time in the winter needed a jump or a push start.What is the record in the Barn for the coldest start?