The new V6 appeared in 1998 and is a very good engine (search 'crankshaft balancer' though), the 5 speed transmission was also 'fixed' in 1998 (I think), the second generation 4-Matic is very good with little problems also. How much is the owner or dealer asking for the car and how many miles? Get it checked out by a MB pro.

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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