The question really is what are your costs and what has created them? I would suggest that you ask your Mitsi dealer for a fleet report detailing your costs to date. You need to know what is generating those maintenance costs. Items like abuse should be identified so they can be managed. The same with costs encurred from a single recurring element like tires or operator abuse or a possible product defect like gearboxes. If they can not provide this information I would look into purchasing from a dealer that can.