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	Sooted oil MRV evaluation equipment
	This apparatus consists of one or more viscometric cells in a temperature-controlled aluminum block.
	The rotation is achieved by applied load acting through a string wound around the rotor shaft.
	A low torque is applied to the rotor shaft to measure yield stress and a high torque is applied to determine apparent viscosity of the oil.
	The SwRI sooted oil MRV evaluation is an API CJ-4-approved method

The sooted oil MRV evaluation is an API CJ-4-approved method that measures the yield stress and viscosity of engine oils after cooling at controlled rates over a period of 43 or 45 hours to a final test temperature of −20 or −25°C. The viscosity measurements are made at a shear stress of 525 Pa over a shear rate of 0.4 to 15 s^-1. The method is suitable for measuring viscosities ranging from 4000 mPas to > 400,000 mPas and is suitable for yield stress measurements of 7 pa to >350 Pa.

Sooted Oil MRV Evaluation Equipment and Procedure

The sooted oil MRV evaluation method uses a mini-rotary viscometer. This apparatus consists of one or more viscometric cells in a temperature-controlled aluminum block. Each cell contains a calibrated rotor-stator set. The rotation is achieved by applied load acting through a string wound around the rotor shaft.

A used engine oil sample is heated at 80°C and then vigorously agitated. The sample is then cooled at a programmed cooling rate to a final test temperature. A low torque is applied to the rotor shaft to measure yield stress and a high torque is applied to determine apparent viscosity of the oil.

Pass/Fail Criteria

For more information about our sooted oil MRV evaluation capabilities, or how you can contract with Southwest Research Institute (SwRI), please contact Becky Grinfield at bgrinfield@swri.org or (210) 522-3652.

sootedoilmrv.swri.org

| Engine Lubricants Research Department | Fuels and Lubricants Research Division | SwRI Home |

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.

December 28, 2012