The Mercury Grand Marquis Air Filter Box provides a layer of protection to the engine. It forces air through a sealed chamber where a pleated filter catches dust and sand before the air reaches the intake manifold, preventing abrasion on metal parts. The Air Filter Box compels every ounce of the approximately 10,000 gallons of air that is burned for every gallon of gasoline passed through that filter, ensuring that only clean oxygen makes combustion and harmful grit never reaches the crankcase oil. Every Grand Marquis is designed for easy-going city dust to somewhat less complicated highway leaves. The Air Filter Box allows for steady performance and longevity. Mercury decided on a simple yet rugged design for the enclosure that the optimal would take for granted. It uses a two-piece plastic housing that opens quickly to allow easy access for changing filters. Yet when closed, it locks tightly to prevent any liquid leaking. Throughout the Mercury range, the Air Filter Box sits near the fender in the classic Grand Marquis platform to maximize cool airflow. Through the years, the design changed very little, which means any Grand Marquis from the first year to the final year has essentially the same faithful Air Filter Box, making regular maintenance easy for every Mercury automobile owner.
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