On "grey market" cars the frequency valve often had a different type of function so I would look carefully at where it is hydraulically attached. If it is spliced into the control pressure circuit you will be much better off without it if you can do so legally.[/QUOTE]

Steve, I have just read another language! If you have a moment, could you explain this in simple terms as to what this is/what it does? Duty cycle? I've got a Grey market 280SL and this is totally greek to me and obviously mine is fitted with this, the extent of my knowledge of this part is I have the plug! What is it and does it have to be adjusted-disconnected "much better off without it if you can do so legally". Legally?
Thanks in advance.
Brian.