Additives probably won't help.

As mentioned above you need to adjust your method of checking the fluid level. 80 degrees C is the magic temperature - clean and re-insert the dip stick several times to make sure you get the same reading.

Checking the fluid level on these transmissions is more anal than trivial.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!