Transmission drain plug - socket size?
 

1998 A8 on hoist this afternoon for trans fluid fill.
I remember from other Audi trannies that a huge Allen was needed to remove the drain/fill plug.

What socket to I need?

17mm hex head
 

17mm hex head

Got it, thanks.
Same (17mm) for all the gear box and rear diff drain?
Ditto fill plugs?

Also: best way to get the correct fill level (for example 9mm under fill hole)?