oh ok cool then.

I don't know which he was referring to, but from the e-mails he sent me I think I can safely assume he was referring to valve seals and not valve stem seals. However I can see why that wear would occur based on your explanation. Poor job by MB on that part.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver