No, its not a post about the merits /demerits of synthetic oils or the use of a Topsider v draining , but it is related in a way. I am about to change the oil+ filter in my car, recommended interval of 9k miles.
In previous invoices from my mercedes-benz dealer I noticed a consumable item OIL FLUSH. I assume refers to the use of a flushing oil to clean out the system before putting in the new oil. Does anyone know if this is standard MB practice for the longer oil change intervals used now? Is this practice necessary/desirable or merely the icing on the cake. I see no mention of it in the service manuals. If this is recommended,who manufactures this flushing oil and where can I buy it and how do I use it? I would be grateful for comments.

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Grober
Last of the ol 124s"