Are there years to avoid? When did the 7 speed come in, and is there a reason to care about the 5 vs. the 7? The 5 speed has been reliable in my E420, I am thinking about a clk500 cab if the price is right... There are two beautiful designo editions on ebay for about 25k

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)