The SDL gets OE filters, the SD gets whatever I cen get cheaper.

When I changed the air filter out in the SD I replaced an old Mann with a new STP. The STP was a complete pos filter compared to the Mann. It had like 1/2 the filter media, and insted of nice soft foam like stuff around the edges for a good seal had cheap hard plastic.

Their is a difference in quality. Whether it matters in the long run is another story.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200