Just one quick question, does your SEL have regular shocks or does it have hydropneumatic skocks? If your car has the self-leveling rear suspension, changing out the shocks isn't going to be cheap or as easy as reg. shocks.

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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