One other potential cause of unexplained water loss is a porous cylinder head.
I have found this twice on early 912 engines, both in the number two head (front
left and rear right (the same part number).
Water seeps through the castings between the water jacket and the exhaust port.
On aircraft that have been left standing for some time (this won't apply to you
John!), it manifests itself as a white corrosion and blue deposit around the
valve base - as viewed through the exhaust port.
Nigel
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