Join Date: Oct 2008
My Motorhome: Hymer B644GL
Thanked 52 Times in 45 Posts
There is a breather on the top of the gearbox, you need to fill it through that using a long thin piece of hose with a funnel in the end, when you fill it use 2.7 litres, that was the last revised recommendation from fiat on quantity.
The breather just pulls up for the lid of it to come off, that's also where it gets in.