Thank you all,

For now I will order the replacement OEM part 05097790AA

But I have read a little into the oil catch can from needswings and it's something I want to do at a later time.

I wasn't able to find a clear answer though, does it really do much other than keep the intake pipes clean, and prevent oil/dirt from dripping into other parts?

What I am trying to wrap my head around is, if the AMG/Merc engineers really though this was an issue would they have not designed the engine bay differently to cater for this? Does it affect performance, has anyone really heard or seen a case were it created a problem, and installing the oil catch can resolved it?

My engine bay needs a good clean and de-greasing anyhow... lol