This method describes a procedure for determining the filter plugging tendency of diesel fuels at low temperature usually due to the formation of wax crystals (Note: The purpose of this filtration step is to remove any contaminants that interfere with the effectiveness of low temperature flow improver additives. However, this pre-filtration step may remove contaminants that affect the low temperature flow properties of the fuel in actual service. Users of this test method may omit the pre-filtration step in order to evaluate potential service problems, but shall identify that they modified the test procedure and that the precision of this test method will not apply.).

The method applies to all distillate diesel fuels. Fuels passing this test are expected to provide satisfactory fuel flow in automotive equipment at temperatures equal to or higher than that of the test.

This method is referenced and compared in ASTM D 4539.

The testing and evaluation of a product against this method may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this method has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any applicable regulatory requirements prior to its use.