At my job we have many Kubota rtv 900's that we use to drive around the yard to perform our work.( I'm sure that if you look at my username, you can guess where i work.) Sometimes they run for days at a time and are only shut off for maintenance. The unit that i have been driving has over 8000 hours on the meter and is still strong. It is around 2 years old, uses no oil and is serviced every 2 weeks. In the winter it runs constantly so it will stay warm inside the cab. These are run in dusty,dirty conditions and they are driven like rental cars. Im amazed at how well they have held up and they will be sold when they hit 10,000 hours and replaced with new ones.