The full flow oil filter shall be tested in accordance with ISO4548 standards:

1. Pressure drop - flow characteristics test - Determination of the pressure drop flow curve of the oil filter assembly.

2. Characteristics of filter element bypass components - Determination of the pressure drop of the filter - bypass flow curve. When a low pressure drop through the filter, to limit the amount of oil unfiltered, by-pass component in pressure drops below a specified open, allowing a small amount of oil; and when the filter is completely blocked, can bypass all traffic and does not exceed the prescribed pressure drop.

3 . High pressure drop and high temperature performance test oil filter in the work (especially when the filter plug) will be subjected to high pressure drop. In addition, the filter element is also affected by the high temperature of the oil, should be tested in the simulation of high temperature conditions to withstand the high pressure drop filter without damage.

4 .Filter life and filtration efficiency test determination to filter by particle counting method, draw pressure during the test - the test of time or pressure - plus the weight of the gray curve to achieve the test time 75% bypass valve opening pressure or pollution.