I haven't replaced the Mercedes pads yet, but in my experience the dealer parts seem the safest, tho probably most expensive, way to go. This was especially true with Hondas, which made grinding noises with non-OEM parts.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma