Hi, your Eaton model 6 hydrostatic transmission requires straight 30 weight oil according to the manual.
Best to use Simplicity Multi-purpose Hydro Oil, part #1685516. Not much more in price than an alternate, and get the proper weight and additives.
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The oil mixture for that motor is 1 pint of oil to 6 gallons of gas
10W-30 motor oil is recommended for use in a Cub Cadet hydrostatic zero turn lawnmower. Any brand of oil is acceptable.
20-50 motor oil
wal mart super tech filter # st3614 or Fram filter # ph3614
A Briggs and Stratton 18 HP V-Twin engine has an oil capacity of 1.75 quarts when the oil filter is also changed. If the oil filter is left on, it will require 1.5 quarts.
Woods Mower hydrostatic hydraulic oil filter
The pressure at the bottom of an oil well is typically determined by the weight of the column of fluid (oil, gas, water) above it, known as hydrostatic pressure. In addition to hydrostatic pressure, there can also be reservoir pressure which is the pressure exerted by the oil and gas reservoir itself. These pressures can vary depending on the depth and characteristics of the well.
To add oil to a Simplicity hydro transmission, first, locate the transmission fill cap, usually found on the top or side of the transmission housing. Remove the cap and use a funnel to pour the recommended type and amount of hydrostatic transmission fluid into the reservoir. After filling, replace the cap securely and run the machine briefly to circulate the fluid, then check the level again to ensure it's at the proper mark. Always refer to the owner's manual for specific instructions and fluid specifications.
i found that the t190 uses hydrostatic hyd oil further research found that transmission fluids are hydrostatic which means you can use either a tractor trans oil or even a torque oil 50 also high temp hyd 100 is also used