ASTM D4857 Standard Test Method for Determination of the Ability of Lubricants to Minimize Ring Sticking and Piston Deposits in Two-Stroke-Cycle Gasoline Engines Other Than Outboards
11. Report and Records
11.1 Report Forms - The required report forms and data dictionary are available from the ASTM Test Monitoring Center.
11.1.1 Include inspection results and ratings for both the non-reference and the benchmark reference oils, with photographs where appropriate.
11.1.2 Include a statement that the non-reference oil was or was not equal to or better than the benchmark reference oil within the tolerances allowed.
11.2 The detailed results obtained from tests on any of the reference oils, including the results obtained from the benchmark reference oil cylinder, shall be made available to ASTM Subcommittee D02.B0.06 upon request so that statistical analysis of test consistency may be made as considered appropriate.
11.3 Retention of Parts and Records:
11.3.1 The testing laboratory shall retain for a minimum of 3 years the piston assemblies and all test spark plugs, the log sheets, recordings, and other test records from both non-reference and benchmark reference cylinders, and the original of the report. The parts shall be protected from atmospheric attack by means of vapor wrapping or other means that will permit re-inspection to be made. A 1-L (1-qt) retain sample from each batch of reference oil and from each batch of test gasoline shall also be similarly retained, recording the amount and type of inhibitors added to the gasoline if such addition is considered to be advisable. Rated test parts shall be retained by the laboratory for a minimum of 1 year.
12. Precision and Bias
12.1 Although the results of the deposit and ring sticking tests of this procedure are expressed numerically, the performance of a non-reference oil is based solely on whether or not it has equalled or surpassed the performance of a reference oil tested simultaneously in the same laboratory. Therefore, no statement can be made at this time about either precision or bias as the result merely states whether there is or is not conformance to the criteria for success specified in the procedure.
13. Keywords
13.1 air-cooled; engine deposits; lubricant; two-cycle gasoline engine
