Expansion tank leak common?

[paul13899]

Hi all. Im new to the e30 world just bought my first red two door 316i 1990 this weekend! its AMAZING!

Only thing that is very annoying at the moment is that the expansion tank appears to have a leak at the bottom?
I think there is an o ring there and have heard its a common fault and i should replace the rad and ET together?

Anyway, pics will be uploaded tomorrow and any thoughts/suggestions would be much apreciated! Oh.. and its an auto.. can only make things more complicated lol...