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	A break-in or a pretest oil flush sequence is used unless the engine build life has been exhausted; then the engine is torn down for rebuild.

The Mack T-11A is a procedure that evaluates the soot handling performance, as measured by viscosity increase, of lubricating oils operating in diesel engines equipped with cooled exhaust gas recirculation. The evaluation is part of specifications:

• Mack EO-N Premium Plus

• Mack EO-N Premium Plus 03

• API CI-4 Plus

• API CJ-4

• EO-O Premium Plus

The Mack T-11A is part of the API CJ-4 category of engine oil procedures, Mack EO-O Premium Plus, and is a replacement test for the Mack T-10A. The Mack T-11A evaluation procedure simulates the following field service:

• Heavy-duty diesel engines

• Stop-and-go operation

• High-soot loading

Mack T-11A Equipment and Procedure

The Mack E-TECH V-MAC III engine used has the following characteristics:

• Electronically controlled fuel injection

• Six electronic unit pumps, using 2002 low-swirl cylinder heads

• Open-chamber

• In-line

• Six-cylinder

• Four-stroke

• Turbocharged

• Air-cooled compression ignition

• Bore and stroke:124 by 165 mm (4-7/8" X 6-1/2")

• Displacement: 12 L (728 in3)

• Cooled exhaust gas recirculation.

A break-in or a pretest oil flush sequence is used unless the engine build life has been exhausted; then the engine is torn down for rebuild.

Controlled parameters include:

• Speed

• Fuel flow

• Intake CO₂

• Inlet manifold temperature

• Coolant out temperature

• Fuel temperature

• Oil gallery temperature

• Intake air temperature

Procedure Results

Oil samples are taken every 12 hours and analyzed for soot content and viscosity. The used oil analysis includes soot and MRV at −20°.

Pass/Fail Criteria

Pass/fail criteria include:

For more information about the Mack T-11A procedure, or how you can contract with Southwest Research Institute (SwRI), please contact Bill Buscher at bbuscher@swri.org or (210) 522-6802.

mackt11a.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