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This is what is happening in your Hydro-Gear ZT-2100 Transmission of your Zero Turn that Husqvarna claims is maintenance free. Hydro-Gear's Service Manual Recommends you use 20W50 Engine Oil. Due to the amount of aluminum shavings found in the oil while servicing the unit, I also added Lucas Oil Stabilizer to each unit. Not sure if it will help with the wear and tear but only time will tell.