Engine.I was in Alaska at minus 50 F and all vehicles were frozen, even after using 10 weight motor oil for wheel bearing grease. (This is what I was told) All vehicles had to be drug into warming sheds with their wheels locked. For this odyssey, I was wondering if it was very cold, the actual motor could have been very difficult to turn, making the starter seem frozen. In addition to battery blankets, there are also dipstick heaters used during the winters for vehicles left outside. They are always plugged in on very cold nights. I am just fishing here. I also agree that the ending is more likely to freeze than a starter.