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I thought recommended TBO for the O-200 is 1800 hrs, not 2000 hrs. If that's correct, his engine is 18 hrs away from TBO.

That's correct. The engine is basically at recommended TBO.

BTW, just another little tid-bit on eBay. It tends to scare some buyers away when you list "AS IS, WHERE IS, NO WARRANTEE." That's already implied in Ebay auctions, but seeing it makes some buyers wonder if the seller's hiding anything. I'd delete that line personally.