Hi BC - I had a '94 E320 wagon and I think they have the same engine - inline 6 with 24 valves? From my memory: the fan clutch goes at about 200,000, the head gasket was replaced in the wagon 3 times over the course of 308,000 miles - the OVP relay will also fail on you - and somebody already mentioned the wiring harness issues. The only reason I got rid of the wagon was the transmission blew - the enigine was still strong at 308,000 and could have probably gone another 200,000 miles.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles