Rear differential fluid change
I personally examined the official MBUSA service documents (where the dealers look up not the books that come with the cars) which show the need for diff fluid change at 2k miles on the prefacelift 205 models but the new 2019-20 document specifically does not show this requirement. Because the pre and facelift are mechanically the same, I assume that many dealers or techs may be looking at one of these two documents and recommend conflicting advice.
One can access these documents and other service and recall related announcements via startekinfo.com. It is a subscription service and for $60 you have full access for 24 hours. I usually log in once a year and print whatever documents related to my car based on its vin.
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