I use bulk 2 stroke dino oil. I have a half gallon of it and I just use that since it's cheap. The bike with the cat on it doesn't smoke much after it gets hot, but mine smokes more. you can notice it on a sunny, hot day with some haze.

When I use my stash up, ill head out and get full synthetic stuff. My mix is between 30-32:1. I have no gauge, so I guestimate.