Someone mentioned the idea of a self oil changing tractor in another post. In my business, our trucks (semi tractors) are set up with a "self lubrication system" that automatically lubricates the the grease points. I think that it consists of lines with some sort of regulators that connect to each grease point along with a pumping process to get the grease where it needs to be. The only thing that it cannot manage is the points on the drive shaft & u-joints. It is a great system - all you have to do is top off the grease reservoir once in a while. Anyone ever heard of such a thing for tractors? Maybe somewhat saphisticated for Ag. use & only used for semi trucks since they are more technically advanced these days.