ASTM D6837-08

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 3856 kg (8500 lb) or less gross vehicle weight trucks. The tests are conducted using a specified 4.6-L spark-ignition engine on a dynamometer test stand. 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 unit values stated in this test method shall be regarded as the standard. Values given in parentheses are provided for information purposes only. SI units are considered the primary units for this test method. The only exception is where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, tubing size, and so forth.

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 Load Control	6.4
Dynamometer	6.4.1
Dynamometer Load	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
Oil Pan	6.13.8
Oil Pump Screen and Pickup Tube	6.13.9
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