Tweeter, the 25 qt. figure may well be another famous John Deere misprint. When I did the 50 hr. break-in service on my 4410, the book called for 27 qts. I found out the hard way when the catch pan ran over! In reality I put about 9 gallons or 36 qts. in the transmission sump. This service is only done every 400 hours and it pays to use the best possible product that is specified and called for. I would recommend sticking with the Hy-Gard Low Viscosity. I used the standard viscosity since I am in a warmer climate.
Chevron makes a very good synthetic THF that meets these requirements. Here is a link to some info. on it. You may be able to find a distributor in your area. This oil is VERY similar to Kubota's Super UDT.
I tried to make a link to the Product Data Sheet work but couldn't so I posted the pdf file in the below post.
There are much cheaper oils out there that claim to meet JD requirements such as those sold at Walmart. I have no idea who makes or what qualites those oils have. The $20 I may save on the oil is not worth the loss of my peace of mind.
In any case good luck on the trans. service! And let me be the first to offer a hearty welcome! :friends: :thumbsup:
Hope to see a lot more of you!