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ASTM D8148 being added to ASTM D975 as an alternative to D4176 Procedure 2 visual method.  Add this verbiage below “In the continuing effort of engine manufacturers to provide cleaner fuels which are critically important to the high-performance modern engines of today, ASTM D2 committee for diesel fuel has added D8148 as an alternative to D4176 Procedure 2 in the workmanship section of D975.