When operating in cold weather, it’s better to not turn on the engine if it has not been warmed up before. The IO-520 may not even turn on when the temperature is below 3-4 °C (37-39 °F).
If you manage to make it start, you may damage it. The CHT would rise too much is a short period of time. Nevertheless, the oil would be too thick to lubricate the engine.
But…we have a solution for that!