There are 410 hours on our KY series Onan Microquiet (if you're deaf). I follow the same procedure as DONEWORKING, regularly exercising the generator. Once a month if it has not been in use. So far, knock wood, the unit has required only the usual maintenance. Previous owner had the exhaust re-routed so that a pipe could be added to vent the exhaust to roof level. A nice feature -- excepting that this addition goes directly across the oil drain plug. Managed to work around that. Although some of the neighborhood kids now know as few German swear words.