ASTM D6593-08

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 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:

		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
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