Bosch Engine Air Filter P/N:5539WS

Keep clean, contaminant-free air flowing to your engine with the Bosch Engine Air Filter 5539WS, a panel-style BOSCH engine air filter designed and tested as a direct OE replacement. Its fit and form are dimensionally validated versus OE for easy installation, and it drops in across a wide range of Audi, BMW and Volkswagen models — including the 2000-2006 BMW X5 [V8-4.4L], 1998-2005 Volkswagen Passat [L4-1.8L], and 1996-2001 Audi A4 [V6-2.8L].

• High-velocity cellulose media: captures wear-inducing contaminants while maintaining low airflow restriction for a steady supply of clean air.
• Optimized pleat design: balances air velocity with high particle-holding capacity for advanced filtration performance.
• Resin-impregnated construction: provides stable pleat geometry and moisture resistance for long-term durability.
• Premium polyurethane seal: a gasket/seal is included and helps prevent unfiltered air from bypassing the filter.

Every filter is air-flow tested, and replacing it on your vehicle's recommended maintenance schedule helps sustain normal engine performance and fuel economy while reducing the risk of costly repairs. It fits dozens of applications — 1996-2001 Audi A4 and A4 Quattro, 1998-2004 Audi A6 and A6 Quattro, 2001-2005 Audi Allroad Quattro, 2000-2002 Audi S4, 2002-2003 Audi S6, 2000-2006 BMW X5, and 1998-2005 Volkswagen Passat, among others; see the Buyer's Guide tab for the full list. Most listed vehicles use one filter; the BMW M5 and BMW Z8 with the V8-5.0L use two. Country of origin: China.