A couple other things to add:

Timing chain and tensioners should be replaced for preventive maintenance after 100K miles.

Motor mounts seem to go around 50K miles.

Air pumps (US models - are they on the Euro models?) seem to go around 80K miles. They get progressively noisier on cold start.

The rear suspension can be flushed every year or two to lengthen the life of the system. It really improves the ride.

I'm currently experiencing a fluctuating idle speed problem in my 300TE at 54K miles - idle speed control switch or OVP relay are suspects at the moment.

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Mark Stetson
1995 E320 Wagon Moonstone Grey/Parchment 106K mi.
2007 E63 AMG Graphite/designo 75K mi