ASTM D6837-09a

1.1 This test method covers an engine test procedure for the measurement of the effects of automotive engine oils on the fuel economy of passenger cars and light-duty trucks with gross vehicle weight of 3856 kg or less. The tests are conducted on a dynamometer test stand using a specified spark-ignition engine with a displacement of 4.6-L. It applies to multiviscosity grade oils used in these applications.

1.2 This test method also provides for the running of an abbreviated length test that is referred to as the VIBSJ. The procedure for VIBSJ is identical to the Sequence VIB with the exception of the items specifically listed in Annex A13. The procedure modifications listed in Annex A13 refer to the corresponding section of the Sequence VIB test method.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3.1 Exceptions - Where there is no direct SI equivalent such as screw threads, National Pipe Threads/diameters, tubing size, or single source supply equipment specifications. Brake Specific Fuel Consumption is measured in kilograms per kilowatthour. In Figs. A2.4, A2.5, and A2.8, inch-pound units are to be regarded as standard.

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 and health practices and determine the applicability of regulatory limitations prior to use.

1.5 This test method is arranged as follows:

Subject	Section
Introduction
Scope	1
Referenced Documents	2
Terminology	3
Summary of Test Method	4
Significance and Use	5
Apparatus	6
General	6.1
Test Engine Configuration	6.2
Laboratory Ambient Conditions	6.3
Engine Speed and Torque Control	6.4
Dynamometer	6.4.1
Dynamometer Torque	6.4.2
Engine Cooling System	6.5
External Oil System	6.6
Fuel System	6.7
Fuel Flow Measurement	6.7.2
Fuel Temperature and Pressure Control to the Fuel Flowmeter	6.7.3
Fuel Temperature and Pressure Control to Engine Fuel Rail	6.7.4
Fuel Supply Pumps	6.7.5
Fuel Filtering	6.7.6
Engine Intake Air Supply	6.8
Intake Air Humidity	6.8.1
Intake Air Filtration	6.8.2
Intake Air Pressure Relief	6.8.3
Temperature Measurement	6.9
Thermocouple Location	6.9.5
AFR Determination	6.10
Exhaust and Exhaust Back Pressure Systems	6.11
Exhaust Manifolds	6.11.1
Laboratory Exhaust System	6.11.2
Exhaust Back Pressure	6.11.3
Pressure Measurement and Pressure Sensor Locations	6.12
Engine Oil	6.12.2
Fuel to Fuel Flowmeter	6.12.3
Fuel to Engine Fuel Rail	6.12.4
Exhaust Back Pressure	6.12.5
Intake Air	6.12.6
Intake Manifold Vacuum/Absolute Pressure	6.12.7
Coolant Flow Differential Pressure	6.12.8
Crankcase Pressure	6.12.9
Engine Hardware and Related Apparatus	6.13
Test Engine Configuration	6.13.1
ECM/EEC (Engine Control) Module	6.13.2
Thermostat/Orifice Plate	6.13.3
Intake Manifold	6.13.4
Flywheel	6.13.5
Wiring Harnesses	6.13.6
EGR Block-Off Plate	6.13.7
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