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Make sure they haven’t actually been using 10w-60 oil. It’s the incorrect oil for this engine, and due to its extreme thickness could cause oil starvation at the bearings, or their trying to hide an oil consumption problems. I’d pass if they are using thicker than recommended oil. Especially if it’s a daily as that oil takes for ever to heat up and flow properly into the various passages.
The S63 engine, is inherently a N63 and both specify 5w-30 if their working correctly.
Assuming the engine isn’t trashed, probably 15k for 105k miles private party.
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