ASTM-D8256 2024

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D8256-24 Standard Test Method for Evaluation of Automotive Engine Oils for Inhibition of Deposit Formation in the Sequence VH Spark-Ignition Engine Fueled with Gasoline and Operated Under Low-Temperature, Light-Duty Conditions

Published By	Publication Date	Number of Pages
ASTM	2024

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Category: ASTM

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Description

ASTM D8256-24

Active Standard: Standard Test Method for Evaluation of Automotive Engine Oils for Inhibition of Deposit Formation in the Sequence VH Spark-Ignition Engine Fueled with Gasoline and Operated Under Low-Temperature, Light-Duty Conditions

ASTM D8256

Scope

1.1 This test method is commonly referred to as the Sequence VH test, and it has been correlated with the Sequence VG test. The Sequence VG test was previously 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 SN, SN Plus 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 A table of contents follows:

1.4 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, 7.7.1, 7.7.2, 7.7.3, 7.7.4, 7.7.5, A5.3.4, and A5.3.5.5.

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.

Keywords

lubricating oils; Sequence VH; sludge and varnish; spark-ignition automotive engine; stop-and-go service;

ICS Code

ICS Number Code 75.100 (Lubricants, industrial oils and related products)

DOI: 10.1520/D8256-24

Additional information

Miscellaneous Engine Components—Preparation	7.6
Humidity	9.7
Fuel Injector Flow Measurements	Annex A15
Sticking	13.5
Solvents and Cleaners Required	7.7
Piston and Ring Measurements Record Forms	Appendix X1
Blowby Flow Rate	14.3
Fuel Consumption Rate	14.5
Required New Engine Parts	7.2
Parts Rating Area—Environment	13.1
APPENDIXES
Interpretation of Test Results	13
Periodic Measurements and Functions	12.3
Sequence VH Test Engine	7.1
Detailed Specifications and Photographs of Apparatus	Annex A7
Keywords	17
Terminology	3
Dipstick Calibration	Annex A11
Exhaust Gas	9.6
Manifold Absolute Pressure (MAP)	14.4
Engine Fluids (Supply/Discharge Systems)	8
Test Procedure	12
Measurement Instrumentation	9
Scope	1
ASTM TMC: Organization	Annex A1
Report Forms	15.1
Final Test Report	15
Special Engine Measurement and Assembly Equipment	7.5
Test Engine Part Number, Classification, and Usage Guidelines	Annex A8
Pressures	9.2
Clogging	13.4
Sources of Materials and Information	Appendix X2
Used Oil Analyses	13.6
Assessment of Test Validity	14
Assembling the Test Engine—Preparations	7.8
Precision and Bias	16
Special Maintenance Procedures	12.4
ASTM TMC: Related Information	Annex A4
Pre-Test Procedure	12.1
Flow Rates	9.3
ASTM TMC: Calibration Procedures	Annex A2
ASTM TMC: Maintenance Activities	Annex A3
ANNEXES
External Oil Heat Exchanger Cleaning Technique	Annex A9
Summary of Test Method	4
Diagnostic Data Review	12.5
Safety Precautions	Annex A5
Test Stand Calibration	11
Varnish Ratings	13.3
Speed and Torque	9.5
Operational Data Log—Engine Oil	Annex A13
Engine Installation on the Test Stand	7.10
Oil Consumption	14.6
End of Test Procedure	12.6
Reusable Engine Parts	7.3
Intake Air	8.1
Fuel and Fuel System	8.2
	Section
Assembling the Test Engine—Installations	7.9
Referenced Documents	2
Critical Part Supplier List	Annex A12
Engine Parts Replacement	14.7
Used Oil Analyses—Interpretation	14.2
General	14.1
Specially Fabricated Engine Parts	7.4
Apparatus (The Test Engine)	7
Significance and Use	5
Fuel Consumption	9.4
Apparatus (General Description)	6
Control and Data Acquisition Requirements	Annex A6
Engine Operating Procedure	12.2
Quality Index	14.8
Temperatures	9.1
Engine Oil and Engine Oil System	8.3
Rating Worksheets	Annex A14
Sequence VH Report Forms and Data Dictionary	Annex A10
Miscellaneous Laboratory Equipment	10
Sludge Ratings	13.2
Coolants	8.4