Oil filters are mainly divided into two categories based on their filtering structure and working mode: full flow and split flow. The working logic, adaptability to vehicle models, and operating conditions of the two are greatly different, and mixing them can seriously damage the engine.

Full flow engine filter is currently the mainstream style of household passenger cars, connected in series between the oil pump and the main oil passage of the engine. All lubricating oil output by the oil pump will be filtered by the filter element and then delivered to various components of the engine. Its advantages include no dead corners in filtration, comprehensive protection, and the ability to purify engine oil in all directions. It is suitable for normal and mild working conditions such as urban commuting and high-speed driving, fully meeting the daily maintenance needs of household cars. The vast majority of private cars on the market come standard with full flow machine filters.

Split flow machine filters are commonly used in heavy-duty trucks, construction machinery, and diesel engines. They are installed in parallel, with only a portion of the oil output from the filter oil pump, and the remaining oil directly entering the main oil passage. The biggest feature of this machine filter is its large capacity for dirt and strong resistance to dirt, which can cope with harsh working conditions such as high load, high dust, and long-term continuous operation.

Large equipment often adopts a combination of full flow and split flow dual filtration, balancing filtration accuracy and fuel supply efficiency. Do not install a split flow filter in household cars, as it will increase oil resistance and affect cold start lubrication; The misuse of full flow machine filters in trucks can easily lead to rapid blockage and failure, and maintenance selection must accurately match the vehicle model.