Oil cooler leak

[Mymercedes220]

Hi.
Apparently the oil cooler is leaking in my C 220cdi.

Is this common, is it likely to be the cooler or a seal? and how accessable is it to change either?

I changed one on a mini but there isn't much space in this 220.

Thanks

 

[Larkone]

Have you looked at the multiple YouTube videos on this? Always useful to put the year as well