The method of "judging the machine by its appearance" is actually very effective，Because a good filter must have a good appearance。The source of the cheap machine filter itself is very suspicious， Their predecessors may be used waste machine filters，Refurbished and reassembled for sale，Of course, you can save on craftsmanship if you can。

    The rubber ring at the inlet and outlet of the machine seabet appfilter is also used to determine the machine filterOne of the good and bad references。You can remove the rubber ring，Pinch with your hands，Feel the texture of the rubber ring。

      Good machine filter，The material of the rubber ring will be very thick，It also feels soft when you pinch it with your hands，To protectVerify the sealing around the inlet and outlet.

Whether it has a check valve，It is also an important basis for judging the quality level of a machine filter。Everyone can use itA small tool around you to identify whether the machine filter has a check valve structure.

      The filter check valve is actually a rubber cup，A very simple component，But its function is very important - it can block the return flow of engine oil，To ensure that the engine is cold started，Can form oil pressure in the lubrication system as early as possible to ensure oil supply，Shorten the engine dry grinding time as much as possible。Simply put，The check valve is after the vehicle is turned off，A device that allows the lubrication system to retain as much oil as possible。

 Good machine filter，The filter element will be firmly fixed inside the machine filter，Withstands both oil pressure and vehicle bumpsWill not shift，To ensure that the engine oil passes through the filter paper to complete the filtration。So，From the degree of fixation of the filter element，Can also judge the quality of a machine filter。

The fifth step: Shake the filter vigorously and listen for any noise

      The basis for judging this move is the same as touching the inner wall - a good machine filter，The fixation of the filter element is also better，There will be no noise from components interfering with each other when shaking.

      As the saying goes: Although a sparrow is small, it has all five internal organs！A small machine filter，But it consists seabet ioof many parts，Except for the shell that we can see when we get it、Outside of bypass valve and sealing ring，Filter element for machine filter、The check valve determines the effectiveness of oil filtration，It can be said to be the heart of the machine filter。In addition，The fixed spring becomes the guarantee that the filter element can work with the correct "posture" for a long time。

      There are two major categories of impurities produced in the engine: one is the metal shavings worn down by the engine parts during operation；  The other type is when the engine oil is in a high temperature state during engine operation，Black clay-like organic matter produced due to chemical changes。These impurities，They will all be mixed in the engine oil，As the oil travels in the lubrication system。

Oil flows in the engine，While lubricating the parts，It will also wash off the impurities attached to the surface of the machine parts。The washed impurities are suspended in the oil under the action of the oil cleaning factor，Random oil flow。When flowing through the machine filter，Large impurities will be filtered out，The filtered clean oil will re-enter the lubrication system for circulation。

 If the filtration ability of the matching machine filter is not strong，Not even filtering capability，Then the uncleanly filtered oil will re-enter the lubrication system，Intensified engine wear。So，Car owners must be willing to "feed" their cars good engine oil，We must also be willing to match good engine oil with a good filter。

Back to the topic we started with，You get what you pay for，Suitable for any product。Machine filter for less than ten yuan，How much better do you think its quality can be？In addition to seabet iothe machine filter made of "Wong Lo Kat"，What are the other symptoms of inferior machine filters？

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