I'm leaving soon to go flying, it will be around 30 where I'm going, maybe 40? Only difference for us flying from 100 to the 30s is we have to open up the high end about 4 clicks and after we get the buggers running then we have to run them at about 4000 rpm for A little bit to get them warmed up. I think maybe your local guru is smoking his hooka A bit too often! No problem with wearing out an engine in the cold. I used to fly A lot when I lived on A mountain and the engines are still in fine shape.