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I can see your point of view more clearly now. It seems like this is really a struggle of whether one intends to keep their car forever or not. 400K miles is quite a lot of miles to rack up on ANY car. Indeed, I can't see any manufacturer purposefully engineering a car to last that long, especially not in today's cost conscious and extremely competitive industries. So the 2% soot level that is universally accepted may be good for lesser miles that that. And after reading that M-B engineers make those newer transmission that are sealed for life with "life" being 150K miles, I can truly see how the 2% soot level may not be fit for much higher miles.
Bottom line: this is all about how long one intends to keep the car in question.
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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
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