The market diesel filter cartridges are divided into genuine factory products,legitimate brand replacement parts,and low-quality high imitation white brand parts,with a large price difference.The appearance of the inferior filter element looks similar,but the accuracy of the filter material is falsely marked and the sealing is poor,which causes damage to the high-pressure pump of the fuel injector in a short period of time.Master the key points of identification and avoid procurement traps.

　　Firstly,look at the packaging printing.Genuine packaging printing is clear,with complete part numbers and anti-counterfeiting labels;The packaging of high imitation parts is blurry,the font is prone to fading,and there is no anti-counterfeiting.The rotary filter cartridge is engraved on the outer shell,and the genuine product is firmly laser coded.The inferior parts can be easily scraped off by inkjet printing.

　　Check the sealing ring:Genuine rubber sealing rings have good elasticity and resistance to diesel corrosion;Poor quality rubber parts are hard and prone to cracking,making them prone to oil leakage and air ingress when installed.Press the sealing ring with your hand upon receiving the goods and observe the rebound effect.

　　Check the filter material(paper core type):The qualified filter material has uniform and neat folds,thick thickness,and a hard and non deformed skeleton;Poor quality filter paper is thin,with sparse wrinkles and a soft skeleton.When the oil pressure is high,the filter paper collapses and impurities directly enter the oil circuit through the filter.Holding it in your hand,the qualified filter element is heavier in weight,while the inferior one is lighter and floaty.

　　Spiral fit thread:Genuine thread is smooth without burrs,and the twisting is smooth;Poor quality threads are rough,prone to slipping,and poorly sealed during installation.

　　Focus on two indicators:common rail fine filtration accuracy and oil-water separation efficiency.Many low-priced white labels are labeled as 5 microns,but in reality,they are only a few dozen microns and have no oil-water separation effect.Differentiation:Qualified substitute parts have brand and part number;The white label has no factory name or part number,and the risk is extremely high.