The biggest difference here is the daily use, the constant push to get to the next job and the weather that constantly is pushing you behind. There may also be the lack of maintenance by employees, because they know you have more money than you know what to do with. We recommend you use the CL100 product line, built for high endurance. 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 mowers 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.