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There is no recommend service interval for the ABC system. For the sagging suspension problem MB says flush, then if still present, replace corresponding valve block. I personally flush or filter the ABC fluid on any repair; strut, line, valve block, etc... I also recalibrate the level stored in the ABC control module after repairs to help keep down on comebacks. Don't know if MB approves but they havent denied any claims yet so Ill keep on doing what I am doing.
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