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Exactly! The cooler circuit control valve that regulates pressure in cooler circuit, the exit point from torque converter, may seal 100% or 25% You may drain your fluid 15 minutes after shut down and have a valve with no leakage or let it sit overnight with a valve that has some leakage and converter is only half full and 2.5 litres extra drains. The assurance of full is to add till it runs out at a defined temperature range. Take away th torque converter and the fluid fill could be defined. If TC had a drain (this stopped in the 70s) and the fill could be predictable.
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