As with anything, time will tell. Generally speaking, "Special Edition" is nothing more than a trim package. Being that you are talking about a 2004 model, it's too early to tell.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member