I second the opinion. My friend has a '94 S350D that has a rod into the piston. Low miles and needs new engine $$$$ Ouch !
See:
http://www.mbz.org./complaints/350D/
Hope this helps.
p.s. ( '84 300SD 130K may soon be available
in San Fran. U-Can e-mail )
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1979 300D
133K miles
1989 300SE
1995 C280