ASTM D6593 test method for evaluation of automotive engine oils
ASTM D6593 standard test method for Evaluation of Automotive Engine Oils for Inhibition of Deposit Formation in a Spark-Ignition Internal Combustion Engine Fueled with Gasoline and Operated Under Low-Temperature, Light-Duty Conditions
15. Final Test Report
15.1 Report Forms - For reference oil tests, the standardized report form set and data dictionary for reporting test results and for summarizing the operational data are required. The photographs can be omitted for the reference oil test reports sent to the TMC.
15.2 Photographs - The required photographs are listed in this section. All photographs shall be 5 by 7 in., and in full color.
15.2.1 RAC and camshaft baffles,
15.2.2 Oil pan and baffle,
15.2.3 Oil pick-up screen,
15.2.4 Cylinder head valve decks,
15.2.5 Timing chain cover, and
15.2.6 Average and worst piston skirts, thrust sides.
16. Precision and Bias
16.1 Test Precision - Reference Oils:
16.1.1 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.
16.1.1.1 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 8 in only one case in twenty.
16.1.2 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.
16.1.2.1 Reproducibility Limit (R) - The difference between two 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 8 in only one case in twenty.
16.2 Bias - Bias will be determined by applying an accepted statistical technique to reference oil test results, and when a significant bias is determined, a severity adjustment will be permitted for non-reference oil test results.
17. Keywords
17.1 lubricating oils; Sequence VG; sludge and varnish; spark-ignition automotive engine; stop-and-go service
