Originally Posted by Mikegjax
It is sealed. No dipstick. Only thing you can do is take it in if you have a leak.
There is a dipstick available to check the fluid level. It is not permanent - it is a service tool only. Insert to check level and then remove. Some transmissions are indeed sealed (like my Tundra) and there is no convenient dipstick method available. (In the Tundra, there is a standpipe in the pan that you use to check the fluid level).
Here is one place to purchase the dipstick - (it actually works on more models than just 2002-2012).
Sprinter Transmission Service Dipstick 2002-2012