At 10 degrees my Stihl oil (orange jug) is so thick it doesn't want to pour. Went to Stihl dealer today to purchase the cold weather oil in a blue jug. They had it. Just ready to head for cash register when the their main maintenance guy talked me out of it unless cutting below zero. He recommended just keep the bottle in the house or vehicle so it will pour easier. Apparently the blue oil can burn up the chain/bar at 10 degrees and warmer? So I saved $15.