Key is the high security key with different cuts on each side of the key. Issue occurs with both driver's door lock and ignition. Sometimes the key works fine. Other times it has to be jiggled and attempted to be turned multiple times before it works. What's going on? Had a replacement made at a locksmith with a machine that reads the key and produces a copy based on the original key and not on the existing key itself. New key has the same issues. Sometimes it's fine, sometimes it wont turn.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13