An engine running on dirty oil won't last. Keep it clean with WANLANDA Oil Filters. It helps to capture harmful contaminants that can harm your engine before they can affect the performance, and life span of your engine. Oil Filter should not just filter engine oil but should do it with high level of efficiency without blocking oil flow and should preserve its quality for sufficient period of time. Efficiency very much depends on the quality and size of filtration media. Using Plate spring and M-pleating of pleating media gives extended filtration area for compact size filters required by new vehicle manufacturers.