Both of our tractors have been working all day six days a week for the month of May getting the summer crops into the ground. They need regular servicing as all diesels do to keep them running well. One farmer once told me there are three things you need to do to keep a tractor working well, change the oil, change the oil and change the oil on time. He used a little more colorful language but you get the point. With one of these beauties costing in excess of $70,000 new we pay attention to such advice.