So I left nine different oils out side over night when the temps got down to -15 Fahrenheit and something surprising happened.
Nine different oils: Valvoline straight 30, Valvoline conventional 10W-40, PYB 10W-30, PYB 5W-20, PP 5W-20, PP 10W-30, CG 0W-30, Mobil Super 5W-30, AMSOIL 10W-40.
So...