Just for kicks I went out to find that plug. Nice and easy to find. Right on the front edge of the exhaust manifold. Look down beside & below the EGR and it is right there. Hex headed bolt. I think I'll throw a little penatrating oil on it for the fun of it. Who knows if someday I will need to take it out!

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.