I have only used Sta Bil as an additive when I am ready to store my lawn and garden equipment and it has worked great for me. I do put some in the tank of the 69 when it is going to be setting all winter. Since I started using it a few years ago in my lawn & Garden equipment, I have not had to have any work done on any of them and they will start right up after setting all winter. I don't even know where to get Star Tron around here but I think I will just stay with Sta Bil as I know it works for what I use it for.
Ron
