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For a regular N63 engine, it's way too much. However, for the S63 engine, many M5 owners, incl. myself are drinking oil at a crazy rate.
For me, 1st 7000km, 1 litre top up for every 1000km. Beyond 7000km, 1 litre top up for every 1500km. dealer service foreman checked bmw service bulletin & said it's normal and the pace of top up will graudally level off.
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