I am about to do the same. The owner of my local shop, which specializes in 9, 2, & 8 N Fords, told me to open all 3 drains, catching most of the oil, then leave them open and let them drip overnight. He said you would get most of the gunk out that way. I'm having trouble finding what I consider the correct oil for the job, which is the only reason I haven't done it yet. I can find, of course, several brands of "Tractor Hydraulic Oil," available at everywhere from WallyWorld to every auto parts shop in town. They are all light oil, however, for modern tractors. I have tried to specify 90 weight hydraulic oil, but all I get is blank stares. I found some oil at NAPA, which is 85-90 weight gear oil, but I'm not sure that's the right stuff. We have no Tractor Supply store locally, so even though I understand they have the right stuff at a hefty price, I can't get it from them. I'm travelling Interstate 10 from New Orleans to San Antonio and back at Christmas, and I recall seeing a Tractor Supply store along the highway, somewhere outside Houston if my memory serves. I think I'll stop there and see what they have, before proceeding with the wrong stuff. Any suggestions past that?
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