Just curious, what type of air filter were you going to buy at this auto parts store? I don't know of any chain auto parts stores that sell any of the OEM filters for Mercedes.

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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