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International Lubricant Evaluation
ACEA* Lubricant Evaluation
Shear Stability Evaluation (CEC L-14-A-93 and ASTM D 6278)
 

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SwRI's shear stability evaluation apparatus

The shear stability laboratory test method CEC L-14-A-93 and ASTM D 6278 offered by Southwest Research Institute (SwRI) evaluates the shear stability of polymer-containing oils.

 

ACEA 2008 Specifications

The shear stability evaluation is part of ACEA 2004 Specifications:

 

Gasoline and Diesel Engines Gasoline and Diesel Engines
with Aftertreatment Devices		 Heavy-Duty Diesel
Engines
A1/B1-08
A3/B3-08
A3/B4-08
A5/B5-08		 C1-08
C2-08
C3-08
C4-08
 E4-08
E6-08
E7-08
E9-08

 

CEC L-14-A-93 Test Parameters

Polymer-containing oil is sheared by passing 170 mL through a diesel-injector nozzle and a two-cylinder fuel injection pump system for 30 cycles. Kinematic viscosities are measured on the sheared and unsheared oil samples in accordance with ASTM D 445 at 100°C. A percentage reduction is calculated from the viscosity results generated. The injection system is adjusted to ensure a viscosity reduction of 2.8 ± 0.1 mm²/s for a specific reference fluid. Once the equipment has been calibrated, other polymer-containing fluids may be run to evaluate the shear stability.

 

image of shear stability evaluation apparatus as the evaluation is conducted at SwRI   image of shear stability evaluation apparatus as the evaluation is conducted at SwRI

The injection system is adjusted to ensure a viscosity reduction of 2.8 ± 0.1 mm²/s for a specific reference fluid.

  

Once the equipment has been calibrated, other polymer-containing fluids may be run to evaluate the shear stability.

 

Pass/Fail Criteria

The pass/fail criteria include maximum variation of characteristics after immersion for 7 days in fresh oil without pre-aging.

 
Gasoline and Diesel Engines
Test Method Properties Limits
A1/B1-08 A3/B3-08 A3/B4-08 A5/B5-08
100°C Viscosity After 30 Cycles (mm2/s)
CDC L-14-A-93
or
ASTM D 6278		 Xw-20 Stay in Grade All
Grades to Stay in Grade		 All
Grades to Stay in Grade		 All
Grades to Stay in Grade
Xw-30 ≥9.3
Xw-40 ≥12.0

 

Gasoline and Diesel Engines with Aftertreatment Devices
Test Method Properties Limits
C1-08 C2-08 C3-08 C4-08
CDC L-14-A-93
or
ASTM D 6278		 100°C Viscosity After 30 Cycles (mm2/s) All Grades
to Stay in
Grade		 All Grades
to Stay in
Grade		 All Grades
to Stay in
Grade		 All Grades
to Stay in
Grade

 

Heavy-Duty Diesel Engines
Test Method Properties Limits
E4-08 E6-08 E7-08 E9-08
CDC L-14-A-93
or
ASTM D 6278		 Viscosity After
30 Cycles Measured at
100°C  (mm2/s)		  Stay in Grade  Stay in Grade Stay in Grade Stay in Grade
ASTM D 6278 Viscosity After
90 Cycles Measured at
100°C  (mm2/s)		 Stay in Grade Stay in Grade Stay in Grade Stay in Grade

 

 

*Association des Constructeurs Européens d'Automobiles/European Automobile Manufacturers Association.

 

For more information about shear stability evaluation (CEC L-14-A-93 and ASTM D 6278), or how you can contract with SwRI, please contact Becky Grinfield at bgrinfield@swri.org or (210) 522-3652.

 

shearstab.swri.org

 

Contact Information

Becky Grinfield

Shear Stability Evaluation (CEC L-14-A-93 and ASTM D 6278)

 (210) 522-3652

bgrinfield@swri.org

shearstab.swri.org

Related Terminology

CEC L-14-A-93

ASTM D 6278

shear stability test

ACEA laboratory tests

ACEA 2008 specifications

shear stability of polymer-containing oils

standardized lubricant testing

engine lubricant
 

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

June 16, 2011