On 09/19/2017 12:57 PM, Chaya Eve wrote:
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?

I can't speak for chainsaws but I use 90W gear oil on both my chain
drive motorcycles and get as good a chain life as some of the fancy
spray products.

I don't know about the used oil part. The generic stuff I buy is about
$10 a quart and lasts a long time.