Welcome to the forum.

Unfortunately we don't have too many new diesels in the US so knowledge is limited to a few people who have experience with the CDI engines. The last C class diesels in the US were W201 chassis cars. Many people here also like the old diesels because they have very few electronics to go bad. Just our stupid automatic climate control.

Best of luck finding a solution to your problem.

Greetings from New York.

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Doug

1987 300TD x 3
2005 E320CDI