I have been using OE MB filters purchased from my local dealer since I got my car in 2004, and have never had any problems.

I cut one open and found the cotten filter media to be clean and white.

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1969 280SE
2027 Ram 1500
2026 Genesis GV70
2007 Tiara 3200
1988 Egg Harbor 37
1981 Boston Whaler 17