Again, there are two schools of thought as to which way is better. We've been using supply side filtration for the last 30 or so years and there are no problems doing it either way if engineered correctly.. The reason for the change had nothing to do with functionality, but more to do with accesibility of the oil filter. On our older units if you wanted to change your filter only and not the oil, you would have to drain the oil to do so. I will reiterate that there are two schools of thought and Goose has received information from one school of thought and some of his points are valid. Again, it all has to do with how you design/engineer the machine and whether it is built correctly. We have also changed to a horizontal shaft motor with a sidemount pump. In this alternate design, both pump and filter are higher up and more protected from anything the splitter might run over while towing. I hope this clears things up?