THIS!!
Sure the chain spends time spinning when mostly out of wood. Cutting limbs & cleaning up faces for instance. However the majority of the time it's not.. I would assume that any sawdust created catches a lot of such oil.
Not worried about it either way. The last time I ran used oil was years ago. Wasn't my saw, or my oil. The boss man makes the rules....
That former employer is now in his 80s with no signs of cancer.. No doubt that he has ingested many oils in many forms many times over many years...
Every time I visit this thread I think of the oil field. Lease operators get all kinds of exposure every day. They don't all succumb to cancer, either. At least not in the fields of sweet high gravity crude. That heavy sour crude is different, hydrogen sulfide!! Although I think that's a quicker demise..