Routine maintenance is one of the most important, time consuming, and most expensive tasks that every gas mower owner is plagued with time and time again throughout the service life of the mower. With Mean Green Mowers, there is very little routine maintenance. There is no internal cumbustion engine, so no spark plugs to clean/change, no carb/injectors to rebuild, no engine oil or filters to change, no hydraulics, no belts, no pulleys, no clutches, no air filters... In fact, there are no oils or liquids to leak or spill at all on Mean Green Mowers. The only "routine" maintenance is greasing the two grease fittings on the front wheels every 50-100 hours! The routine maintenance time and money saved by owning a Mean Green Mower is substantial - as much as $3,000-$5,000 over the service life of the mower compared to most gas commercial mowers!