
It labels the thing bolted to the front of the engine bay (4) as "Gas Recycling Breather" and the hose (5) as "Engine Breather Hose".
I've been filling up the engine oil using that, assuming it's there because the one at the top of the engine is an arse to get to.
Now I look at the manual, it tells me to fill oil on the top of the engine:

Here's what they look like in real life. No way I'm getting a 5 litre bottle to that one on the head:

Surely I've not been doing it wrong all this time!