I have a 1610 TS and was getting ready to change transmission fluid and was told to use hydraulic transmission fluid from a dealer and the book called for 90W gear oil. The dealer also said that it did not matter. I was just wondering what everyone else uses and also there are 2 plugs underneath one being under the transmission and one at the rear of the axel. Are both of these the same? I bought a 5 gallon bucket of 303 from Tractor Supply and thought I would ask what everyone else uses before I put this in. Thanks in advance, Rambo