SwRI: Viscosity at High-Temperature and High-Shear Rate Test, CEC L-36-A-90, International Lubricant Testing, ACEA Lubrican Test

Viscosity at high-temperature and high-shear rate laboratory evaluation method CEC L-36-A-90 is offered by Southwest Research Institute (SwRI) to determine the dynamic viscosity of oils at 150°C using a Ravenfield high-shear rate, tapered-plug viscometer.


Ravenfield high-shear rate, tapered-plug viscometer in use, performing a high-shear rate laboratory evaluation method at SwRI		Ravenfield high-shear rate, tapered-plug viscometer

ACEA 2008 Specifications

The viscosity at high-temperature and high-shear rate evaluation is part of ACEA 2008 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-36-A-90 Test Parameters

The lubricant being tested fills the annulus between a close-fitting rotor and stator. The rotor and stator have a gradual matching taper to allow adjustment of the gap and, hence, the shear rate. The rotor is spun at a known speed, and the lubricant viscosity is determined by comparing the measurements of the reaction torque to a reference line prepared using Newtonian calibration oils.

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
Property	Limits
Property	A1/B1-08	A3/B3-08	A3/B4-08	A5/B5-08
Viscosity at 150°C and 10⁶s^-1 Shear Rate, mPas	xW-20– Min. 2.6 Max. 3.5 All Others Min. 2.9	≥3.5	≥3.5	Min. 2.9 Max. 3.5

Gasoline and Diesel Engines with Aftertreatment Devices
Property	Limits
Property	C1-08	C2-08	C3-08	C4-08
Viscosity at 150°C and 10⁶s^-1 Shear Rate, mPas	≥2.9	≥2.9	≥3.5	≥3.5

Heavy-Duty Diesel Engines
Property	Limits
Property	E4-08	E6-08	E7-04	E9-04
Viscosity at 150°C and 10⁶s^-1 Shear Rate, mPas	≥3.5	≥3.5	≥3.5	≥3.5

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

For more information about viscosity at high-temperature and high-shear rate evaluation (CEC L-36-A-90) capabilities at SwRI or how you can contract with SwRI, please contact Becky Grinfield at bgrinfield@swri.org or (210) 522-3652.

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Southwest Research InstituteŽ (SwRIŽ) 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.