On the Z3, easiest thing we found was a fake a lake connected to a bilge pump in a 15 gallon tote half filled with RV antifreeze (8 gallons). Used alligator clips on the battery for the pump. Turned on pump first then started the engine and ran to operating temp with the 15 gallon tote under the exhaust to catch the return. Lost a total of 2 gallons from the dripless shaft feed through that timeframe and some through the fake a lake but has full strength antifreeze in it now.
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