The pressure loss is improved by up to 10% (normal ratio) by optimizing the filter medium area, filter medium storage shape, etc. in order to remove the sludge (foreign matter) generated inside the engine as much as possible. Furthermore, sludge (foreign matter) is efficiently removed by adopting a filter medium with a Y-shaped cross section of the filter medium fiber, and the internal wear of the engine is prevented. In addition, high heat resistance acrylic rubber (gasket) and silicone rubber (anti drain) are used to cope with high oil temperature conditions of the engine.
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