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Of course the oil pump/pressure lube system would not be affected.
Any gain would happen if, when the crankcase is "full", windage is occurring on the crankshaft, as well as more oil getting flung off rods and whatnot. If lowering it to "add" reduces windage there ya are. Running it at "add" is still safe to the engine but you may want to check level more frequently as the "cushion" is smaller.
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