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Clean engine vapor

Engine

Vehicle Information: Model: 911 Carrera; Year: 1988; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 147,000;

My current 911 has no oil leaks (incredible!), plus excellent compression and no smoke. Five 911s over 30 years have all been daily drivers, enjoyed year-around in cold Colorado and Alaska. And all have shared a characteristic: At startup on really cold days (zero or colder), the engine exhausts huge billows of clean, white steam. Until I get some heat on the gauge the car is almost invisible as the engine pumps out billowing white vapor. So, is there a characteristic of 911s, air-cooled engines in general or the 911 exhaust system that would produce so much steam? If it's a clue, my '89 930 generated far less exhaust vapor. The effect seems harmless; actually it's kinda fun. The emailed tech tips are appreciated here in Juneau, Alaska.

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