I was at our local Kubota dealership yesterday to buy filters and UDT to support my first B2301 400 hour service. The manual says 16 quarts (4 gallons) of UDT for the transmission (understanding that this is a shared oil with hydraulics) and 3.7 quarts for front axle, which is 19.7 quarts or 4.92 gallons. The service department told me I needed 16 quarts (4 gallons) for the transmission, another 19 quarts for hydraulics and 3.7 quarts for front axle, which is 38.7 quarts or 9.675 gallons. I was only planning to purchase 5 gallons of UDT for $130, but based upon their recommendation, I bought an extra 5 gallons. All the youtube videos I watch, they only mention the 4 gallons of UDT and 3.7 quarts...nothing is ever mentioned about the other 19 quarts the service department told me about and sold me on. Does anyone know or understand the additional 19 quarts they are talking about?