Bosch 5657WS Workshop Engine Air Filter

The Bosch 5657WS Workshop Engine Air Filter is a premium replacement panel air filter engineered to protect your engine from harmful airborne contaminants. Part of Bosch's trusted Workshop Series, this filter delivers up to 98% filtration efficiency — tested to ISO 5011 standards — to keep dirt, dust, and microscopic particles out of your engine's intake.

Key Features:

• High filtration efficiency — Up to 98% particle capture rate to guard against engine wear and maintain performance
• High-capacity cellulose filter media — High-velocity, cured cellulose construction with a high pleat count maximizes dust-holding capacity and surface area
• Even pleat distance — Precision-engineered pleat spacing ensures consistent, low air restriction for optimal airflow to the engine
• Polyurethane foam seal — Imported PU foam gasket provides a secure, gap-free seal with excellent elasticity, heat resistance, and water resistance — eliminating unfiltered air bypass
• Panel shape — Direct-fit drop-in replacement design for straightforward installation
• Meets OEM specifications — Engineered to match or exceed original equipment standards for filtration and fit
• Special media coating — Provides inflammation (fire) protection for added safety

The Bosch 5657WS is part of the Workshop Air Filter line, designed to offer professional installers and DIY mechanics broad vehicle coverage with consistent, reliable performance. Replacing a dirty air filter at every oil change interval helps restore engine protection, fuel efficiency, and acceleration response.