Yes some folks use 1/2 tranny fluid and 1/2 whatever oil...dont use WD-40. Marvel Mystery oil or 3in 1 oil is okay. I had a brand new OS 60 that I used after run oil in religiously. I burned out the unused fuel, every time i was through for the day. This engine produced black oil from the git go when I took it apart the bearings were rusty.l Go figure