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[motto]

Dave, I might be teaching Granny to suck eggs as the saying goes but I have found that it is a good idea to change the oil in an engine that has not run for many years before firing it up for the first time.
The reason is that over time the solids drop out of suspension and the oil looks surprisingly clean on the dip stick but there may be a layer of complete crap waiting to be picked up or mixed up and circulated.
I don't know how long it takes for the crud to settle out but this I have experienced and always take the precaution now of changing the oil on an unknown engine.

David