STP SA50084 Irregular Engine Air Filter delivers superior engine protection with advanced cellulose filtration media that captures up to 99% of airborne particles. Designed to enhance engine performance by ensuring optimal airflow of clean air, this filter meets or exceeds original equipment standards. For sustained engine efficiency and protection, it is recommended to replace the filter every 12,000 miles. Trusted worldwide, STP air filters combine durability and high filtration capacity to extend filter life and maintain peak engine operation.