I am thinking of installing a hydraulic oil cooler system on my hustler ztr. The service people where I bought the machines used tell me that only the super z's need the oil coolers due to the increased speed and torque. I asked if installing them on my machines would increase the life of the pumps and the drive wheel motors. They told me not really. I would like some insight on this, the units will cost me around $400 is it worth it or is it not really going to help?