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Maybe your right, but it seems very pointless checking the engine and then not checking the starter when its off, but as you said, some don't look at the big picture, but I still feel my initial diagnosis of a fuel bleed off into the crankcase and then evaporation of that fuel leaving just the oil when left stored is the real issue and is indeed correct.  I have seen this same issue quite a few times and I am sure you have too and this issue it's not restricted to just chainsaws.