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The engine oil aeration test (EOAT) determines the effectiveness of engine lubricating oils at minimizing air entrainment in large pickups and medium-duty trucks under high-speed, high-load applications. This test is part of:

• API CG-4

• API CH-4

• API CI-4

Engine Oil Aeration Test Equipment and Procedure

The test engine is a 1994 International truck 7.3-liter, V-8, four-stroke, turbocharged, compression-ignition engine using the HEUI (hydraulically-actuated, electronically-controlled unit injector) fuel injection system. The engine is rated at 215 bhp at 3,000 rpm.

Test Results

At test hours 1, 5, and 20, the oil is evaluated to determine the amount of entrained air in it. The lubricant is analyzed for wear metals at 0 and 20 hours. At 20 hours, the maximum allowable amount of air entrained in the oil is 8% for API CH-4 and API CI-4 and 10% for API CG-4.

Each test is run for 20 hours at rated speed and load conditions with controlled water out, fuel, and inlet air temperatures and intake air restriction.

Between tests, the engine is flushed twice, for one hour each, with the next test oil.

For more information about the engine oil aeration test capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please e-mail Scott Ellis, or call (210) 522-3399.

| 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.

September 06, 2007