O ring
No one mentioned it, but the old style filter bolt that uses the crush washer also has a single o-ring on its shaft. You will need to replace this o-ring as well. The crush washer can generally be used 2x by flipping it over after the first filter change.
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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)
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