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944 ('87NA) owner here, engine rebuild I'd completed in Spring of 2021...chiming in to say that my car loves the Porsche Classic 10W/50 - the level of which has remained absolutely unmoved at the top line of the oil stick, coming up on one year (about 3,500 miles of year round driving) since I'd last changed this oil.
But I do have a question: Part of my "theory" about the Spring oil change to begin a one-year cycle is that by the time Winter rolls around, the oil itself will have "thinned out" just a tad - lowering its effective (10W/50) rating so that cold (northern Vermont Winter) starts are a bit easier than if this
oil were fresh. Does this make sense...or might I have it backwards?
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