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Just as a note, in my 1973 manual in the days of only Dino oil, Porsche lists a maximum temperature of 265 F.
As far as Shulisco's comments about Synthetic not having the additives needed to keep the seals from leaking, High Mileage full Synthetics do have additives to prevent seal and gasket leaks, and also reduce sludge build up.
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Ed
1973.5 T
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