Gilly,
Thanks again for your quick response.
I am thinking of doing a spark plug change on both cars - '97 c230 and '99 ML320.

I know the ML is a tougher job. But what about the '97 c230 - is it relatively straightforward/easy - I mean easy access and just a standard spark plug wrench, etc... and do you know the torque setting when putting in new ones?

Thanks,