Me too. The SLS on my '84 Euro 500SEL doesn't work. I haven't yet even started diagnosing it, but I'd also love to see a detailed explanation on how the sucker works. :p

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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