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Warhawk626
The "correct" oil depends on the clearance between the bearing shells and the crankshaft, connecting rods, camshaft. A less viscous oil may escape out from between the bearing shell and crank-etc. faster than the oil pump can replenish it.
I would suggest you get a real, mechanical, oil pressure gauge to at least compare what sort of pressures you are getting now, and after the lighter oil. The later versions of your engine may have smaller clearances in the bearings than yours does.
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