Chaya Eve writes:

I just changed my transmission of 75W90 GL-4 (low sulfur) spec.

What do you think of using it as bar oil for my Husky chain saw?

Anyone done it?

The advantage is obvious.
What's the drawback (don't guess because I can guess too).

I'm asking if anyone has ever used used gear oil for chain lube and lived
to tell the story about how it worked out?

When you use a chain saw, that oil ends up in the environment including
your face. Any oil will lubricate the chain, but you really don't want
to put toxic stuff in your eyes, mouth, and nose.

https://www.fs.fed.us/eng/pubs/html/.../98511316.html

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Dan Espen