【国外标准】 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

5.1 This test method is used to evaluate an automotive engine oil's control of engine deposits under operating conditions deliberately selected to accelerate deposit formation. This test method was correlated with field service data, determined from side-by-side comparisons of two or more oils in police, taxi fleets, and delivery van services. The same field service oils were then used in developing the operating conditions of this test procedure.FIG. 1 Schematic of Engine Fuel System5.2 This test method, along with other test methods, defines the minimum performance level of the API Category SL (detailed information about this category is included in Specification D4485). This test method is also incorporated in automobile manufacturers' factory-fill specifications.5.3 The basic engine used in this test method is representative of many that are in modern automobiles. This factor, along with the accelerated operating conditions, should be considered when interpreting test results.1.1 This test method covers and is commonly referred to as the Sequence VG test,2 and it has been correlated with vehicles used in stop-and-go service prior to 1996, particularly with regard to sludge and varnish formation.3 It is one of the test methods required to evaluate oils intended to satisfy the API SL performance category.1.2 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.1.2.1 Exception—Where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, tubing size, or specified single source equipment.1.3 This 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. Specific hazard statements are given in 7.7, 7.10.2.2, 8.3.4.2, 8.4.4.3, 9.2.6, 9.3.4.5, 12.1.1.7, 12.2.1.4, and Annex A5.1.4 A Table of Contents follows:  Section 1Referenced Documents 2Terminology 3Summary of Test Method 4 5Apparatus (General Description) 6Apparatus (The Test Engine) 7  Sequence VG Test Engine 7.1  Required New Engine Parts 7.2  Reusable Engine Parts 7.3  Specially Fabricated Engine Parts 7.4  Special Engine Measurement and Assembly Equipment 7.5  Miscellaneous Engine Components-Preparation 7.6  Solvents and Cleaners Required 7.7  Assembling the Test Engine-Preparations 7.8  Assembling the Test Engine-Installations 7.9  Engine Installation on the Test Stand 7.10Engine Fluids (Supply/Discharge Systems) 8  Intake Air 8.1  Fuel and Fuel System 8.2  Engine Oil and Engine Oil System 8.3  Coolants 8.4Measurement Instrumentation 9  Temperatures 9.1  Pressures 9.2  Flow Rates 9.3  Fuel Consumption 9.4  Speed and Load 9.5  Exhaust Gas 9.6  Humidity 9.7Miscellaneous Laboratory Equipment 10Test Stand Calibration 11Test Procedure 12  Pre-Test Procedure 12.1  Engine Operating Procedure 12.2  Periodic Measurements and Functions 12.3  Special Maintenance Procedures 12.4  Diagnostic Data Review 12.5  End of Test Procedure 12.6Interpretation of Test Results 13  Parts Rating Area-Environment 13.1  Sludge Ratings 13.2  Varnish Ratings 13.3  Clogging 13.4  Sticking 13.5  Used Oil Analyses 13.6Assessment of Test Validity 14  General 14.1  Used Oil Analyses-Interpretation 14.2  Blowby Flow Rate 14.3  Manifold Absolute Pressure 14.4  Fuel Consumption Rate 14.5  Oil Consumption 14.6  Engine Parts Replacement 14.7  Quality Index and Deviation Percentage 14.8Final Test Report 15  Report Forms 15.1Precision and Bias 16Keywords 17ANNEXES    ASTM Test Monitoring Center Organization Annex A1  ASTM Test Monitoring Center: Calibration Procedures Annex A2  ASTM Test Monitoring Center: Maintenance Activities Annex A3  ASTM Test Monitoring Center: Related Information Annex A4  Safety Precautions Annex A5  Control and Data Acquisition Requirements Annex A6  Detailed Specifications and Photographs of Apparatus Annex A7  Special Service Tools for the Test Engine Annex A8  Test Engine Part Number Listing Annex A9  External Oil Heat Exchanger Cleaning Technique Annex A10  Sequence VG Report Forms and Data Dictionary Annex A11  Dipstick Calibration Annex A12  Critical Part Supplier List Annex A13  Operational Data Log-Engine Oil Annex A14  Rating Worksheets Annex A15  Fuel Injector Flow Measurements Annex A16APPENDIXES    Piston and Ring Measurements Record Forms Appendix X1  Sources of Materials and Information Appendix X2  Description of Scott Quarterly Gas Audit Service Appendix X31.5 This 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.