Extend-A-Stay mode for the Model MPH12VDC or MPH24VDC unit. Designed to allow you extra time on the ground. Once you land, hook up the device per instructions, and you will have many more hours of "on the ground time". In an emergency this unit can get your engine up to a starting temperature in an hour or so. Coming from a cold engine condition with everything in place as described, this can be an actual life saver. You will need to decide on settings, placements and other parameters based on your local conditions.
Performance of each part number is dependent on pad placement, reflector placement, OAT, probe placement and controller settings. Maximize the contact area of the pad to the oil sump to get the best heat transfer into the sump. Position the reflector/shield in a like fashion. Good cowling covers, propeller covers, and spinner covers are a considerable advantage to achieving the successful preheat oil temperatures you desire, especially in severe cold temperatures.