Quote:
Originally Posted by spearfish25
That's interesting Mike. My experience has been the opposite. I spoke with the Mocal guys who said they guarantee the oil will backflow through the sandwich plate if the cooler fittings are down. There are no check valves and the sandwich plate is always at least partially open.
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From when I talked to Mocal about this ages ago, they said the paths to the oil cooler are actually permanently open. Nothing ever closes over those paths. The thermostatic valve controls the flow passageway that bypasses the cooler, closing it off as temps rise. So yes, it will definitely drain back if gravity allows (bottom fittings).