The Mazda Protege Oil Filter is the first line of defense in the engine, where the filter catches grit and sludge to ensure clean lubricant flows to each component of the engine. It literally forces pressurized oil through a dense medium of either cellulose, synthetic fibers, or any combination of them to remove as much as 99 percent of harmful debris without choking the flow, thus keeping wear and heat under control between service intervals. In previous model years, several Mazda vehicles applied quick-change spin-on filters, which assembled the housing and element as a single package, though environmental factors have influenced more recent Mazda models, such as some versions of the Protege, to use cartridge-type units, which allow replacement of the internal element only and allow the rest of the shell to be refurbished. They both use spring-loaded pressure relief valves to prevent rupture during cold starts and silicone anti-drainback seals that do not allow the oil to pour out of the gallery at night, so the car is lubricated immediately after the key is turned. Capacity is also important since the filter should possess the ability to store contaminants over thousands of miles, and the manufacturer stipulates volumes of media that are large enough to slow contaminant saturation until the next oil change. When drivers increase viscosity or rev harder, the strong construction of the factory filter is resistant to the high pressure which may collapse a normal unit. Routine replacement of the Oil Filter and fresh oil helps the engine continue to have the lively character that makes a Mazda a fun drive. A neglected Oil Filter threatens to limit the flow, accumulate sludge, and cause a tremendous reduction in performance.
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