The Volkswagen Passat Air Filter protects the engine by filtering the air that enters the engine, so dust and particles never enter the sensitive areas of the engine. A typical Volkswagen engine burns close to 10,000 gallons of air to one gallon of fuel, so it relies on this shield to keep its power and mileage consistent, since an air-blocked element can only cut its performance and its economy. The filter contains pleated paper as its primary Air Filter medium, capturing particles as small as about five microns, about a fraction of a human hair, before they can scar cylinders or sensors. Over the years, the majority of fuel-injected versions of the Volkswagen sedan applied a rectangular piece, which fits in a sealed air box and is connected to the throttle body by a duct, whereas older carbureted or some diesel models applied a circular one, mounted above the throttle body. Both designs operate by the same principle, but layout and surface area are applied to the maximum in the tight engine bays with the panel style, and the round design gives easy access through a wing nut. Whatever the shape, the dry style prevails as it is economical, efficient, and can be replaced easily, but there is an oiled variant that increases the dirt-holding ability in dusty situations. One of the easy jobs that an owner can undertake is regular renewal of the Air Filter, which only needs simple hand tools and a minute or two to make sure every Volkswagen engine continues breathing clean air with no restrictions during daily driving, highway cruising, or spirited rides in a Passat.
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