Originally Posted by Pleiades

That little part is modified oil trap in the crankcase breather. On 2008 built bikes the baffling inside wasn't sufficient to catch the oil mist when high engine speeds were maintained for longer periods (long hauls on the motorway). Some bikes had the later oil trap fitted by dealers under warranty, some didn't.

Mine's an 08 bike and it hasn't had the modified part fitted. My dealer fudged the issue, then it ran out of warranty! Never bothered since.

The air box drain tube only ever gets full on a long fast ride 200 miles plus on the motorway. In normal use I find about a 10-15ml every month. Even when it's full there's only about 35ml in it (I measured it once). You can't even notice the loss on the dip stick. No where near what your getting? Do you ride a lot at high engine speeds for extends periods?

The updated part is cheap, but a bit of an arse to fit. So it might be worth a try? But with the amount of oil your losing, I doubt is the fault of the crankcase breather?

I fitted a 30cm longer drain pipe and tucked the extra length in the bash plate so it has more capacity and you see what's in it on longer trips without it backing up onto the air box.