1.1 本试验方法涵盖并通常称为顺序VG试验， 2. 而且它与1996年之前在走走停停服务中使用的车辆有关，特别是在污泥和清漆形成方面。 3. 这是评估满足API SL性能类别的机油所需的测试方法之一。 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.2.1 例外情况- 如果没有直接的SI等效物，例如螺纹、国家管道螺纹/直径、管道尺寸或指定的单源设备。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 具体危险说明见 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 和 附件A5 . 1.4 目录如下: 部分 范围 1. 参考文件 2. 术语 3. 试验方法总结 4. 意义和用途 5. 仪器（一般说明） 6. 仪器（测试发动机） 7. 序列VG测试引擎 7.1 所需的新发动机零件 7.2 可重复使用的发动机零件 7.3 特殊制造的发动机零件 7.4 专用发动机测量和装配设备 7.5 其他发动机部件准备 7.6 需要溶剂和清洁剂 7.7 装配测试发动机准备 7.8 组装测试发动机装置 7.9 在试验台上安装发动机 7.10 发动机油液（供应/排放系统） 8. 进气 8.1 燃油和燃油系统 8.2 发动机机油和发动机机油系统 8.3 冷却剂 8.4 测量仪器 9 温度 9.1 压力 9.2 流速 9.3 燃油消耗量 9.4 速度和负载 9.5 废气 9.6 湿度 9.7 其他实验室设备 10 试验台校准 11 试验程序 12 预测试程序 12.1 发动机操作程序 12.2 定期测量和功能 12.3 特殊维护程序 12.4 诊断数据审查 12.5 试验程序结束 12.6 测试结果的解释 13 零件评级区域环境 13.1 污泥等级 13.2 清漆额定值 13.3 堵塞 13.4 粘滞 13.5 废油分析 13.6 测试有效性评估 14 全体的 14.1 二手油分析解释 14.2 窜气流量 14.3 歧管绝对压力 14.4 燃油消耗率 14.5 机油消耗量 14.6 发动机零件的更换 14.7 质量指标和偏差百分比 14.8 最终测试报告 15 报告表格 15.1 精度和偏差 16 关键词 17 附件 ASTM测试监测中心组织 附件A1 ASTM测试监测中心:校准程序 附件A2 ASTM测试监测中心:维护活动 附件A3 ASTM测试监测中心:相关信息 附件A4 安全注意事项 附件A5 控制和数据采集要求 附录A6 仪器的详细规格和照片 附件A7 测试发动机的专用维修工具 附录A8 测试发动机零件号清单 附录A9 外部油热交换器清洗技术 附件A10 序列VG报表和数据字典 附录A11 油尺校准 附录A12 关键零件供应商清单 附录A13 运行数据记录发动机机油 附录A14 评级工作表 附录A15 喷油器流量测量 附录A16 附录 活塞和活塞环测量记录表 附录X1 材料和信息来源 附录X2 Scott季度天然气审计服务说明 附录X3 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法用于评估汽车发动机油在特意选择以加速沉积物形成的操作条件下对发动机沉积物的控制。该测试方法与现场服务数据相关，从侧面确定- 顺便比较警察、出租车车队和送货车服务中的两种或两种以上机油。然后，在制定本试验程序的操作条件时，使用了相同的现场使用油。 图1 发动机燃油系统示意图 5.2 本测试方法与其他测试方法一起定义了API SL类的最低性能水平（规范中包含了有关该类的详细信息） D4485 ). 该试验方法也包含在汽车制造商的工厂填充规范中。 5.3 本试验方法中使用的基本发动机是现代汽车中许多发动机的代表。 在解释试验结果时，应考虑该因素以及加速运行条件。

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 Scope 1 Referenced Documents 2 Terminology 3 Summary of Test Method 4 Significance and Use 5 Apparatus (General Description) 6 Apparatus (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 7.10 Engine Fluids (Supply/Discharge Systems) 8 Intake Air 8.1 Fuel and Fuel System 8.2 Engine Oil and Engine Oil System 8.3 Coolants 8.4 Measurement 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 9.7 Miscellaneous Laboratory Equipment 10 Test Stand Calibration 11 Test 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 12.6 Interpretation 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 13.6 Assessment 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 14.8 Final Test Report 15 Report Forms 15.1 Precision and Bias 16 Keywords 17 ANNEXES 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 A16 APPENDIXES Piston and Ring Measurements Record Forms Appendix X1 Sources of Materials and Information Appendix X2 Description of Scott Quarterly Gas Audit Service Appendix X3 1.5 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. ====== Significance And Use ====== 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 System 5.2 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.