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If it was me, I'd go with Mobil-1 synthetic rather than some sort of "oil-flush". I've heard of some engines with high mileage leaking a bit after changing to M1, but my experience is that it may leak a bit more for a few thousand miles (5-10K) but will soon return to previous or lower levels of leaking. And I'll bet it quiets your lifters and increases your idle oil pressure, too. I don't *think* Mercedes recommends ANY additives to the oil, but I could be wrong. Just my 2 cents.
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