ASTM D6594 method for evaluation of corrosiveness of diesel engine oil at 135 °C
12. Report
12.1 Report (see Annex A2 for Report Format) the tarnish rating of the copper specimen (as determined in 10.3) based on the highest rating (most corrosion) if the rating is different for either side.
12.2 Report the concentrations of copper, lead, and tin in the new oil (C1 in 10.5.2) and stressed oil (C2 in 10.5.2), and the respective changes in metal concentrations (ΔC in 10.5.2).
13. Precision and Bias
13.1 Test Precision - Reference Oils:
13.1.1 Intermediate Precision, (formerly called repeatability conditions) - Conditions where test results are obtained with the same test method using the same test oil, with changing conditions such as operators, measuring equipment, test stands, test engines, and time.
13.1.1.1 Intermediate Precision Limit (i.p.) - The difference between two results obtained under intermediate precision conditions that would, in the long run, in the normal and correct conduct of the test method, exceed the values shown in Table 1 in only one case in twenty.
13.1.2 Reproducibility Conditions - Conditions where test results are obtained with the same test method using the same test oil in different laboratories with different operators using different equipment.
13.1.2.1 Reproducibility Limit (R) - The difference between results obtained under reproducibility conditions that would, in the long run, in the normal and correct conduct of the test method, exceed the values in Table 1 in only one case in twenty.
13.1.3 ΔTin, content precision to be determined when an appropriate reference oil is located.
13.2 Bias is unknown at this time, but will be determined as more data are collected.
14. Keywords
14.1 corrosion; diesel engine; lubricant
