TOPRAN air filter (400 317) maintains peak combustion efficiency by delivering a clean, metered airflow to the intake manifold while blocking dust, pollen, and fine road debris. Filter geometry — Length [mm]: 355 mm, Width [mm]: 136 mm, Height [mm]: 50 mm, Required quantity: Steel — is optimised to maximise surface area within the airbox housing, reducing restriction and extending service intervals without sacrificing filtration efficiency. Panel dimensions and seal profile match the original airbox on MERCEDES-BENZ models, so installation takes minutes with no trimming or adapters required. Cross-references OE filter numbers: 012 094 0040/S, 02.14.092, 04268, 0 986 626 802 and 184 more. TOPRAN air filtration elements are tested to ISO 5011 standards for fractional efficiency, ensuring the engine management system receives clean air data for accurate fuelling across all load points. Air filters should be inspected every 12,000–15,000 miles and replaced when visibly dirty or at least once a year — vehicles driven on dusty or unpaved roads may need more frequent changes. Symptoms of a clogged air filter include reduced acceleration, lower fuel economy, a rough idle, and in extreme cases the engine management light illuminating due to incorrect air-fuel ratios. Replacing an air filter is one of the simplest DIY tasks on any car — usually just unclip the airbox lid, lift out the old element, drop in the new one, and re-seal; no tools required on most vehicles. Choose a filter that matches the OEM filtration efficiency rating (typically 99%+ particle capture) — cheaper filters with lower efficiency let more abrasive particles through to cylinder bores and valve stems. A clean air filter can improve fuel efficiency by up to 10% and helps your engine breathe properly, extending the life of downstream sensors such as the mass airflow meter and oxygen sensors. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.

TOPRAN, part of the Hans Thomsen Group headquartered in Hamburg, Germany, is a growing independent aftermarket brand focused on providing quality parts at accessible prices. TOPRAN offers a comprehensive range covering engine, cooling, electrical, braking, and body components for European vehicles. All TOPRAN products are manufactured to meet OE specifications and undergo quality testing before distribution. Combining German quality management with competitive pricing, TOPRAN is an excellent choice for cost-conscious motorists and workshops who do not want to compromise on part quality.