Full Hydro change on the 2008 JD 2520 300hr about 3.7 gallons drained. Spin on fiter changed suction tube cleaned magnets cleaned and reinstalled inside tube little concerned about material found on screen but seems normal for what I see on web. Filled with Triax Agra UTTO Supreme seems to be fine little noise till air was worked out of system. Really needed to get done as winter is on us and it was getting a whine when cold unit stored inside not heated we see how this holds up. Any questions just ask