Tried starting the CJ6 today, and it is -10 here (14 F for my Yankee brethern down south). The jeep cranks over slowly, but won't start. I need to change over to a winter oil, and I'm looking for recommendations for a good winter oil for here. Some necessary info.....gets down to -40 here (both temp scales). Also...what's the correct procedure for starting in cold temps? I've got a basic understanding....is there a SPECIFIC procedure or is it more of a black art, go by the feel of it thing?