2009 John Deere X320 - Servicing the 'unserviceable' K58 Tuff-Torque transaxle. This 'sealed' transaxle has no drain bungs, no reservoir and no documentation in the owner's manual. Drives me crazy (short trip) when something is designed to be 'unserviceable'... It took about 2.25 Liters of the JD low viscosity hydrostatic oil. Next time around I can drop the bungs and change the oil (defeating the capitalist 'throw-away' society thugs.)