That is without question the weakest argument I have ever seen in my life.
After spending thousands on a tractor, people are so particular about the fluids they use until their warranty expires, the majority are afraid to even use anything except the exact products that were made, and used, by the manufacturer, even though lots of other products, that meet, or exceed, the specifications in the owners manual are available. In many cases, even after the warranty expires, they are not willing to use a different product.
As a matter of fact, it is very common to see new owners who are so concerned about the service being done properly, the don't even want to change the oil themselves.
In the event that someone could be feebleminded enough to purchase, and or, try to dump, any quantity of gear oil in their hydo, because they thought that they read it was okay, in my post. Keep in mind, they would also have to be somehow astute enough to know where the filler is.
But, I appreciate you clearing that up. :thumbsup: