Performance-wise, the Hengst Air Filter is one of the few auto accessories that will surely deliver the goods to your Mercedes 420SEL. And why is this so? It is because the air filters from Hengst will surely remove dust, dirt, and soot particles from the intake air, thus reducing engine wear and preventing the impairment of the sensitive electronic components. This product from Hengst contains state-of-the-art filtering media which are specially impregnated so as to resist heat and humidity. It also features original equipment quality, stability, and precise fit. If this filter and its service intervals are properly maintained in your 1991 Mercedes 420SEL, the B1000-11967 Hengst Air Filter will ensure an optimally metered fuel and air mixture, thus guaranteeing optimum combustion. This will then create the necessary prerequisites for a high engine performance, long engine life due to reduced wear, and cost savings through the avoidance of expensive repairs. Having the Hengst Air Filter in your Mercedes is a sound investment, so better not think twice. Lose no time and visit our site, and see for yourself our online catalog that carries products from the Hengst brand, like air filters. The Hengst Air Filter will deliver air filtration like no other in the market.