As in most lawn care equipment we recommend you treat this product with our CL-100 product. It was designed for endurance and the heavy workloads the job requires. Remember to clean all breather and filters after 2nd treatment. Time and neglect has varnished and carbonized the engine. CL100 has a cleaner that does it’s work first and then the micro resin is deposited into the steel of the engine. Your blowers will last longer and keep running. Please remember Microlon does not fix mechanical problems, so your units need to be in good running order before treatment or you are throwing your money away. This is a one-time treatment you will never do it again.