I'm not sure how cold it gets in Montana but up here I am loving my new autostart! I had a block heater installed but hardly ever plug it in anymore (I try to remember but it only gets plugged in like once a week) I don't really notice a difference wether it was plugged in or not. It was pretty inexpensive for it to be installed though. For oil I use 5w-30 in the winter and 10w-30 in the summer. I use all synthetic fluids, and encourage everyone to do the same.

However with the autostart and warming it up every morning, during lunch, after work, and whenever else I am only seeing 10 miles to the gallon. I use 92 octane and am supercharged