Getting back to the oil for a moment --
I wonder if synthetic oil is harder to control from leaking. An engine builder I know said flat-out that synthetic oil in his experience was harder to contain around the rear main seal and "one way or the other it will find it's way to leak somewhere".
I never tried synthetic oil in a vintage engine because I believed they weren't designed around better tolerances and roller everything like a modern engine is.
I'm not that brave in experimenting with my 389
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