Область применения

1.1 This test method covers and is commonly referred to as the Sequence VG test, and it has been correlated with vehicles used in stop-and-go service prior to 1996, particularly with regard to sludge and varnish formation. 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. The values given in parentheses are for information only.

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 and health 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 A1.

1.4 A Table of Contents follows:

SectionScope1Referenced Documents2Terminology3Summary of Test Method4Significance and Use5Apparatus (General Description)6Apparatus (The Test Engine)7Sequence VG Test Engine7.1Required New Engine Parts7.2Reusable Engine Parts7.3Specially Fabricated Engine Parts7.4Special Engine Measurement and Assembly Equipment7.5Miscellaneous Engine Components-Preparation7.6Solvents and Cleaners Required7.7Assembling the Test Engine-Preparations7.8Assembling the Test Engine-Installations7.9Engine Installation on the Test Stand7.10Engine Fluids (Supply/Discharge Systems)8Intake Air8.1Fuel and Fuel System8.2Engine Oil and Engine Oil System8.3Coolants8.4Measurement Instrumentation9Temperatures9.1Pressures9.2Flow Rates9.3Fuel Consumption9.4Speed and Load9.5Exhaust Gas9.6Humidity9.7Miscellaneous Laboratory Equipment10Test Stand Calibration11Test Procedure12Pre-Test Procedure12.1Engine Operating Procedure12.2Periodic Measurements and Functions12.3Special Maintenance Procedures12.4Diagnostic Data Review12.5End of Test Procedure12.6Interpretation of Test Results13Parts Rating Area-Environment13.1Sludge Ratings13.2Varnish Ratings13.3Clogging13.4Sticking13.5Used Oil Analyses13.6Assessment of Test Validity14General14.1Used Oil Analyses-Interpretation14.2Blowby Flow Rate14.3Manifold Absolute Pressure14.4Fuel Consumption Rate14.5Oil Consumption14.6Engine Parts Replacement14.7Quality Index and Deviation Percentage14.8Final Test Report15Report Forms15.1Precision and Bias16Keywords17ANNEXES Safety HazardsAnnex A1Control and Data Acquisition RequirementsAnnex A2Detailed Specifications and Photographs of ApparatusAnnex A3Special Service Tools for the Test EngineAnnex A4Test Engine Part Number ListingAnnex A5External Oil Heat Exchanger Cleaning TechniqueAnnex A6Sequence VG Report Forms and Data DictionaryAnnex A7Dipstick CalibrationAnnex A8Critical Part Supplier ListAnnex A9Operational Data Log-Engine OilAnnex A10Rating WorksheetsAnnex A11Fuel Injector Flow MeasurementsAnnex A12APPENDIXESPiston and Ring Measurements Record FormsAppendix X1Sources of Materials and InformationAppendix X2Description of Scott Quarterly Gas Audit ServiceAppendix X3