We recommend the use of our Microlon 4oz. Fuel Treatment product. We would start by adding two ounces directly into the blowers fuel tank and fill the rest with your next fill up. That’s it for the life on the mower. It will run smoother, start easier and last longer. If this is an older model you will have to clean the air breather/filter as the cleaner will have deposited the old varnish and sludge build up that was in the engine.