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1987 944 Turbo Mysterious coolant loss

Engine

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 118,000;

At 90,000 miles my motor blew a hose and overheated. The overheating caused the head to warp slightly and so combined with the extra pressure my chip puts out, shortly thereafter I blew a head gasket. It was replaced by the local dealer. The head had to be shaved to flatten it out. 20,000 miles later, I had the radiator replaced because the car was running too hot. This fixed the overheating problem, but I noticed a small amount of black, oily residue in the resivoir. The oil dipstick looks perfectly clean and normal. Now for the mystery... After shutdown, a full resivoir of coolant will almost entirely disappear overnight. NO leaks on driveway at all. Dipstick continues to look fine. No coolant smells or leaks in interior. Local Porsche fixit shop pressure checked radiator and found only very minor leaks they tightened up. They're as miffed as I am. If it was another bad head gasket, the coolant should disappear while driving, not mysteriously after shutdown. So far about 2 resivoirs of coolant has vanished. Note: My 87 Turbo has the improved oil cooler to coolant seals.

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