I have a home standby generator that uses standard auto 5 - 30 synthetic oil. It sits idle but could turn on for a power outage at any time. The factory says it is a good idea to install their $100 oil filter heater if our area gets below 32f. The installer says it is not needed in our area, lower Michigan. The winter averages in the 20s with lows in the teens and with a few weeks in the single digits, like this week. Is the $100 filter heater a good needed for this oil?
Air cooled engine.
Air cooled engine.