ASTM D6891 Standard Test Method for Evaluation of Automotive Engine Oils in the Sequence IVA Spark-Ignition Engine
13. Test Report
13.1 Report Format - For reference oil results, use the standardized report form set available from the ASTM TMC and data dictionary for reporting tests results and for summarizing operational data.
NOTE 14 - Report the non-reference oil test results on these same forms if the results are intended to be submitted as candidate oil results against a specification.
13.1.1 Fill out the report forms according to the formats shown in the data dictionary.
13.1.2 Transmit results to the TMC within five working days of test completion.
13.1.3 Transmit the results electronically as described in the ASTM Data Communications Committee Test Report Transmission Model (Section 2 - Flat File Transmission Format) available from the ASTM TMC. Upload files via the TMC's website.
13.2 Report all reference oil test results, whether aborted, invalidated, or successfully completed, to the TMC.
13.3 Deviations from Test Operational Limits - Report all deviations from specified test operational limits.
13.4 Precision of Reported Units - Use the Practice E29 rounding-off method for critical pass/fail test result data. Report the data to the same precision as indicated in data dictionary.
13.5 In the space provided, note the time, date, test hour, and duration of any shutdown or off-test condition. Document the outcome of all prior reference oil tests from the current calibration sequence that were operationally or statistically invalid.
13.6 If a calibration period is extended beyond the normal calibration period length, make a note in the comment section and attach a written confirmation of the granted extension from the TMC to the test report. List the outcomes of previous runs that may need to be considered as part of the extension in the comment section.
13.7 Photographs - The final test report does not require photographs.
14. Precision and Bias
14.1 Precision:
14.1.1 Test precision is established on the basis of reference oil test results (for operationally-valid tests) monitored by the TMC. The data are reviewed semiannually by the Sequence IVA Surveillance Panel. Contact TMC for the current industry data.
14.1.1.1 Intermediate Precision Conditions - Conditions where test results are obtained in the same laboratory with the same test method using the same test oil, with changing conditions such as operators, measuring equipment, test stands, and time between tests.
NOTE 15 - "Intermediate precision" is the appropriate term for this test method, rather than "repeatability", which defines more rigorous within-laboratory conditions.
14.1.1.2 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 value show in Table 9, in only one case in twenty. When only a single test result is available, the Intermediate Precision Limit can be used to calculate a range (test result +/- Intermediate Precision Limit) outside of which a second test result would be expected to fall about one time in twenty.
14.1.1.3 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.
14.1.1.4 Reproducibility Limit (R) - The difference obtained under reproducibility conditions that would in the long run, in the normal and correct conduct of the test method, exceed the value shown in Table 9, in only one case in twenty. When only a single test result is available, the Reproducibility Limit can be used to calculate a range (test result +/- Reproducibility Limit) outside of which a second test result would be expected to fall about one time in twenty.
14.2 Bias - Bias is determined by applying an acceptable statistical technique to reference oil test results and when a significant bias is determined, a severity adjustment is permitted for non-reference oil test results. This technique is described in TMC 94-200.
15. Keywords
15.1 cam lobe wear; crankcase oils; lubricants; valve-train wear
