If your engine sat for 30 years and had sludge in it, then you could have a ring or rings that are stuck allowing things to mix with your oiiiillll. Drain enough of your oil out to add about 1/2 quart of Marvel Mystery Oil in your crankcase. Run it at LEI for a few minutes, then drain out all oiiillll and refill with Kohler 30w. Then place a magnet sheet on the bottom of your oiiiillll pan to hold metal shavings in the lower part of your crankcase to prevent them circulating in the engine. Keep in mind the magnet won't totally prevent all of the metal shavings from circulating since the depth of the oiiillll pan is not that deep, but it may help prevent some of them. Then, as my Uncle Lewy said.....run it and enjoy!
Cub Cadet 123
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Still don't know what I'm doing in OHIO?.....If you find me, then please point me back toward INDIANA. 
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