1.1This test method evaluates an engine oil's resistance to aeration in automotive diesel engine service. It is commonly referred to as the Caterpillar-C13 Engine-Oil Aeration Test (COAT). The test is conducted under high-engine-speed (1800 r/min), zero-load conditions using a specified Caterpillar 320 kW, direct-injection, turbocharged, after-cooled, six-cylinder diesel engine designed for heavy-duty, on-highway truck use. This test method was developed as a replacement for Test Method D6894.
Note 1:Companion test methods used to evaluate engine oil performance for specification requirements are discussed in the latest revision of Specification D4485.
1.2The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1Exception—Where there is no direct SI equivalent, for example, screw threads, national pipe threads/diameters, and tubing size.
1.3This test method is arranged as follows:
| | Section |
| Scope | 1 |
| Referenced Documents | 2 |
| Terminology | 3 |
| Summary of Test Method | 4 |
| Significance and Use | 5 |
| Apparatus | 6 |
| Engine Liquids and Cleaning Solvent | 7 |
| Preparation of Apparatus | 8 |
| Engine Stand Calibration and Non-Reference Oil Tests | 9 |
| Procedure | 10 |
| Calculation, Test Validity and Test Results | 11 |
| Report | 12 |
| Precision and Bias | 13 |
| Keywords | 14 |
| ASTM Test Monitoring Center Organization | Annex A1 |
| Safety Precautions | Annex A2 |
| Engine and Engine Build Parts Kit | Annex A3 |
| Oil Temperature Control System | Annex A4 |
| Engine Modifications and Instrumentation | Annex A5 |
| External Oil System | Annex A6 |
| Aeration Measurement System | Annex A7 |
| Specified Units and Formats | Annex A8 |
| ASTM TMC: Calibration Procedures | Annex A9 |
| ASTM TMC: Maintenance Activities | Annex A10 |
| ASTM TMC: Related Information | Annex A11 |
| Engine Break-in and Silicon Passivation Procedure | Annex A12 |
| Schedule for Taking Oil Samples and Carrying out Analyses | Annex A13 |
| Determination of Operational Validity | Annex A14 |
| Specification for PC-10 ULSD Fuel | Annex A15 |
| Typical System Configuration | Appendix X1 |
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Annex A2 for general safety precautions.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.