ASTM D7899 Standard Test Method for Measuring the Merit of Dispersancy of In-Service Engine Oils with Blotter Spot Method
11. Report
11.1 Record the results from the apparatus, as the merit of dispersancy of the sample obtained by the procedure, and reference this test method.
11.2 The measurement of the merit of dispersancy is the primary measurement of this test method. However, two other parameters measured by this test method can be recorded, the contamination index (IC) and the weighted demerit (DP). If these parameters are requested, record the results from the apparatus, as the contamination index (IC) and the weighted demerit (DP) of the sample obtained by the procedure, and reference this test method.
12. Precision
12.1 The repeatability standard deviation from a single operator, 31 different samples, and one laboratory with four different instruments has been determined to be 1.7.
13. Keywords
13.1 condition monitoring; diesel engine oils; dispersancy; in-service petroleum lubricants; lubricants; oils; oxidation; soot
