Originally Posted by Vernl
Your engine should be warm to touch when its plugged in and you can hear a slight 'hiss' similar to an electric tea kettle when its plugged in. Also check to make sure that where you are plugging in, actually has power..lots of times an outside plug has a tripped breaker.One more thing in northern climates...switch to a full synthetic oil and use a 0-30 or something similar. It works miracles
Thanks for all the replies! I know the outside plug has power since my extension cord has a light in it. I also brought a little light out and tried it on that plug and it works. I'll check the back of the engine in the morning to make sure it's warm.
I just had my last oil change done at the dealership here in town and I'm assuming they used Motorcraft 5w20 but nothing was indicated on the bill. If this cold snap keeps up I'm going to try switching to full-syn.