[QUOTE=If I may..... I also read the discussion about the SPRING PERCHES on the E300/320 which many have reported broken while driving. I was just wondering if anyone has an update on this problem, especially from Mercedes Benz.[/QUOTE]
I had one spring perch starting to fail. Mercedes replaced both sides and covered 1/2 the cost. I suggest you remove both front tires and check for rust.
Post #12 has pictures of mine:
w210 front spring replacement
For the spark plugs I used hand tools and took my time getting the old plugs loose. I also did them with the engine warm. Take your time getting the plug boots/wires loose, I twisted them to break them loose before pulling on
them.
Here is a link that may be of use:
1998 E320 spark plug installation
Hope this helps.