Filter efficiency>99%Traps more contaminants before they enter the fuel delivery system for improved engine performance | Imported from Italy AhlstromItaly Ahlstrom filter materrial has better strength, burst resistance and stiffness, the filter paper folding distance is more uniform, results in higher dust holding capacity and longer span life than normal filter material | Synthetic fiber materialThe filter efficiency of normal cellulose or cellulose and glass fiber mixed material is around 75% at 20 Micron and life span is around 6,000 miles, while our synthetic fiber material is 99% at 4 Micron and 20,000 - 40,000 miles |