We have been running hps machines for 3+ seasons, and have been overall very pleased with these machines. If you currently run them or plan to, we strongly recommend the following. Change the oil and filters every 25 hours, remove the pull start housing and spray liquid wrench directly into the center/spring every 25 hours. Grease the articulation points weekly, grease the front axle daily, check and lube control levers weekly, start and run the engine for 5 minutes directly after washdown as these kawasaki's dont like water. Air filter life depends on what you run through the machine, if you run a lot of dusty lime, change the filter often.