SwRI: Sequence VIA (ASTM D 6202) Test Method for ILSAC GF-2

  image of stand that runs the 80-hour Sequence VIA test at SwRI during which fuel consumption is measured for 6 speed, load, and temperature test conditions for an SAE 5W-30 baseline oil (BC)
 

During the 80-hour Sequence VIA procedure at SwRI, fuel consumption is measured for 6 speed, load, and temperature test conditions for an SAE 5W-30 baseline oil (BC).

The Sequence VIA (ASTM D 6202) procedure measures the effects of automotive engine oils on the fuel economy of gasoline engine passenger cars and light-duty (3,856 kg, 8,500 lb or less gross vehicle weight) trucks equipped with a low-friction engine.


Sequence VIA Test Equipment and Procedure

A 1993 4.6-liter Ford modular V-8 gasoline engine equipped with an external oil heating/cooling system and a flying flush system for changing oils without an engine shutdown is used for the Sequence VIA test.


During the 80-hour test, fuel consumption is measured for 6 speed, load, and temperature test conditions for an SAE 5W-30 baseline oil (BC). The candidate oil is introduced and aged for 16 hours; fuel consumption is measured for each of the 6 test conditions, then followed by a repeat of the BC at the 6 test conditions.

 

CONDITIONS

TEST STAGES

1

2

3

4

5

6

 Speed, rpm

800

800

1,500

1,500

1,500

800

 Power, kW

2.18

2.18

15.39

15.39

15.39

2.18

 Oil temp, °C

105

70

70

70

45

45

 Coolant temp, °C

  95

60

60

60

60

60


Sequence VIA Test Results

At test end, results are expressed as a percent of change in kg of fuel consumed for the candidate oil compared to the average of the BC. New oil and oil after Aging Phase II viscosities at 40 °C and 100 °C are required. Fuel economy improvement, which equates to the FTP chassis dynamometer test, is calculated by the following formula where units for BSFC are kg/kW-hr:

 

Stage

Actual (kg/kW-H)

Normal
Power (kW)

Time
Factor (H)

Fuel
Consumed (kg)

1

BSFC

×

  2.18

×

0.077472

=

 

2

BSFC

×

  2.18

×

0.082500

=

 

3

BSFC

×

  5.81

×

0.035417

=

 

4

BSFC

×

15.39

×

0.078250

=

 

5

BSFC

×

15.39

×

0.033139

=

 

6

BSFC

×

  2.18

×

0.045444

=

 

       Total mass fuel consumption for all five stages =
       In lieu of original Stage 7, which has been deleted, add 0.2540 kg


The total fuel consumed as shown above for the BC oil is computed for:

  • Before candidate oil

  • Candidate oil

  • BC after the candidate oil

The average BC fuel consumption is calculated for:

  • BC before candidate oil

  • BC after the candidate oil

The candidate oil fuel economy improvement (FEI) is computed as follows:
 

%FEI = [(BC average – candidate) / BC average] × 100


Sequence VIA Pass/Fail Criteria

Pass/fail criteria for ILSAC GF-2 for SAE viscosity grades are as follows:

 

SAE VISCOSITY GRADES

MINIMUM
FEI vs. BC (%)

 0W-20 and 5W-20

1.4

 Other 0W and 5W multiviscosity

1.1

 10W multiviscosity

0.5


For more information about the Sequence VIA (ASTM D 6202) procedure capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please contact Guy Stubbs at gstubbs@swri.org or (210) 522-5039.

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Southwest Research Institute® (SwRI®) is an independent, nonprofit, applied engineering and physical sciences research and development organization with 12 technical divisions using multidisciplinary approaches to problem solving. The Institute occupies more than 1,200 acres and provides nearly two million square feet of laboratories, test facilities, workshops, and offices for more than 3,300 employees who perform contract work for industry and government clients.