Is it okay to mix Blue Marble® 2-Cycle Oil with other oils (synthetic or mineral)?
We don’t recommend doing this if possible, especially the first time that you use it. If you happen to run out of Blue Marble® at some point, and you have to use another brand of oil, it can be added to Blue Marble®; however, the benefits from Blue Marble® will likely diminish (almost completely) with that first use of the mixed tank.