Check to see if the transmission has been replaced yet. If not....it might cost you sooner than later. It's somewhat common for 98's to have transmissions go bad. Mine was replaced at 90K miles; though I did not foot the bill.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)