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A lot of interesting thoughts in this thread.
I would guess Porsche could care less either way if the engines lasted or didn’t last. It’s probably more of an annoyance to keep making old parts, rather than a money maker.
I doubt they do any real R&D for the old engines, but I’m guessing they supply the oil to their restoration department.
To bill’s point any immediate discovery of less oil leakage needs to be tempered by the fact that it may take 10s of thousands of miles to discover that the new oil is causing a friction problem. So to say “I ran xx oil for years, and switched to zz oil this summer and it’s great” is of very little meaning in the cosmic scale.
To also be Bill’s counter point; I highly doubt the oils sold today that have the same label as the oils in the service manual have much in common with the oil in the parts store 40 years ago when my 911 rolled out of the dealer. The spec requirements have certainly changed, for better or for worse. The sad truth is that for most vintage 911 owners and the way they operate their cars combined with the lifetime expected miles.... I bet any oil higher than 0w from the parts store would do just fine. It may trash the engines after 100k miles, but no one is going to find out. Anecdotally, I run Amsoil 20w50 high zinc in my fresh engine and brad penn 20w50 in my 100k plus mile engine. I have not lost a wink of sleep over it. If a case of Porsche classic fell off the truck at my house I wouldn’t be afraid to try it
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