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"Air Filter Replacement" falls under the automotive maintenance category, specifically focusing on the upkeep of vehicle engines. This process involves removing the old, dirty air filter from the engine compartment and replacing it with a new one. The air filter's primary function is to prevent dirt, dust, and other debris from entering the engine, ensuring optimal performance and longevity. Regular replacement of the air filter is crucial for maintaining transmission service and overall vehicle health, as a clogged filter can restrict airflow and lead to engine damage over time.