It's my understanding that Tri-flow contains Teflon.
I often use gun oil for the same reason you use clock oil, I like the
container/dispenser. It's easy to get it where you want it and it doesn't flood everything (those 4 oz. bottles of sewing machine oil with the little spout seem to make a big mess). However, once the container is empty, I refill it with sewing machine oil.
I have a friend who is into repairing/rebuilding old typewriters. He uses sewing machine oil because it is so clean. He buys it by the gallon. He says sewing machine oil is sewing machine oil.
I'm not saying any of this is right, it's what I do.
bkay