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Since the hydraulic fluid in this 1967 International 2504 industrial tractor is severely contaminated with water, we're going to need to change it out. So, we'll start by draining as much of the bad hydraulic oil as we can. Of course, I greatly underestimated just how much hydraulic fluid is actually in the tractor. Apparently this tractor can hold about 13 gallons of hydraulic oil, and a little 5 gallon drain pan isn't gonna get the job done. Quite the messy experience if I do say so myself.