Posted for "babyblue" <grabiel@freeway.net>:

 Reiff Airplane Preheat Systems (TSIO550)Jeff,
  I have the Reiff Hotstrip oil sump heater on my IO-550.I live in Northern
Michigan and fly at least 3 times a week. It is an absolute must. It works
great.
 
    Don Grabiel
    ES N722B