JayG is correct - an engine left in dirty oil is a train wreck about to happen.
Used to go with a buddy to old farms looking for old motors.
He would pull the stick - If oil was fairly clean he would make an offer.
If oil was dirty he walked away.
He had no idea of acid build up and we learned of this at a later date.
All he new was if the engine was in dirty oil they were usually trashed in the inside.
When I store anything I put fresh oil in it - Lawn mower, Snow Blower, ect.
Have a great day and to the fella that the mechanic says it can sit in old oil while stored - good luck with that.
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