Check your owner's manual.There should be a chart for oils. If you have a freeze plug heater, and plug it in a little while before starting, I don't see why 15-40 won't work for you. I start my Fords down to zero this way.
Check your owner's manual.There should be a chart for oils. If you have a freeze plug heater, and plug it in a little while before starting, I don't see why 15-40 won't work for you. I start my Fords down to zero this way.