I said that I would post an update after doing the hydro oil change to Chevron Synthetic THF. I too looked at various hydro oils. After Stormcom's positive results (and a couple of conversations with him) and the fact I really like the tractor, I thought that I would give the Chevron product a try.
A special shout out and thank you to Stormcom!!! He picked up (2) five gallon pails of Chevron Synthetic THF and shipped them to me. Again, thanks Stormcom! I'm still waiting on my not so local jobber to get the Chevron oil to me. Probably, won't be until late June, now.
I am not affiliated with Chevron, AGCO or Massey. As a fact, I'm not impressed with Chevron on their level of customer service or their ability to help me locate and purchase the referenced oil.
I changed the hydro fluid to the Chevron product and used new Massey factory filters. I wouldn't believe this, if I wasn't experiencing it myself. IT IS LIKE A COMPLETELY DIFFERENT TRACTOR! I only have about 15 hours of run time on the new oil. However, so far, so good! I want to run for several more hours to see what happens.
Noticeable changes (tractor has 250 total hours on it now):
1) Hydraulics are much smoother! Can't put a number on it. But, it is noticeable.
2) Hydraulics have been quieted down markedly.
3) Hydro whine has been substantially reduced. Gone from annoying to barely noticeable.
4) Tractor is running cooler. I've been doing box blade work and pushing the tractor. Tractor has not gotten hot enough to go into power step down mode as described in the service manual. This would normally happen after about 3 to 4 hours of operation in the summer. Never in the winter when plowing. I was told by several dealers that it was normal for the hydro unit to reduce power after tractor is run in hot weather after several continuous hours of operation. I never understood this as being correct.
5) Reverse chatter is gone. When tractor would get hot after continuous hours of operation, when I went to go into reverse there would be a distinct chatter/grabbing feeling when trying to move in reverse. This hasn't happened since the hydro oil change.
6) Easy into Gear - this is in reference to snail, turtle and rabbit gears. Before the change, sometimes it would be difficult to get into a specific gear. Now, it almost falls into gear. My wife used the tractor the other day and asked me if I adjusted the linkage or something. Nope. She also commented on how smooth the tractor seemed to move from forward to reverse.
7) The 3-point hitch is a lot smoother. The lever moves more freely and implements move up and down easier and are not as jumpy as before.
When I say noticeable difference, I'm not talking about a 10% or 15% improvement, it is much more! Your personal experience may vary on this and I'm not recommending to anyone to make this change with their tractor. I'm just trying to be honest and comment on what I'm experiencing. I was planning to trade this tractor in on a bigger unit due to all of the above. If it keeps working as I've described, I will definitely keep it.