No mate, it runs absolutely sweet, never had to change an o-ring or anything on it. Comes with marker oil & grease,
The only thing that needs changing is the macro line, as if its not in the right place you hear a small a leak from it. I have a spare macro line (in red) which i never put on as it doesnt match very well.
I can get vouches if you need, if you're in any doubt or more photos.
One of the locks on the case is broken.
Dan