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Sounds like your ML didn't stop using oil but rather dosn't use as much oil.
You didn't state which weight of Mobil 1 you use. Mercedes only recommends 0W40 or 5W50 for the Mobil 1 products. During the cold winter months I recommend 0W40.
On previous non-Mercedes cars, I had good luck with Rislone oil treatment.
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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles
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