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ISO 4548-2:1997
Methods of test for full-flow lubricating oil filters for internal combustion engines -- Part 2: Element by-pass valve characteristics
This part of ISO 4548 specifies tests for determining the element by-pass valve characteristics of full-flow lubricating oil filters for internal combustion engines.
Tests are specified with oils at two viscosities, one to assess the performance of an element by-pass valve with a cold oil and the other to assess its performance with an oil at a typical operating temperature.
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International Organization for Standardization [iso]
