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Being from LA, I have no FHE. Though I'm somewhat interested in the responses, as I may be moving back to New England in a couple years. FWIW, I'm using the Mobil 1 15w-50. I would think that the 15 weight oil would be OK in a New England fall. I wouldn't think there would be too many air-cooled 911s running around in New England during those 3 weeks in February where it doesn't get above freezing.
I don't think there's a reason why a motor can't go back and forth between dino and synthetic oil. I think there was actually a question in this month's Excellence about this exact issue. The expert opinion was that it's OK to switch. Anecdotally, some people have noted an increase in oil leaks if they switched from dino to synthetic. But there's no real harm done to the motor.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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