No more than the top line on the stick. Look at both sides and use the lower reading.

If the level gets too high the rotating parts get into the pool of fluid and foam it up. When this happens the fluid often comes out the vent at the top and makes a mess. I have seen cars get so foamed up they would no longer drive. The clutches and bands will not apply under vapor pressure, they need real hydraulic pressure.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician