SwRI: EOAT, Engine Oil Aeration Test determines the effectiveness of engine lubricating oils at minimizing air entrainment

	The EOAT engine is a 1994 International truck 7.3-liter, V-8, four-stroke, turbocharged, compression-ignition engine using the HEUI fuel injection system.

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. The EOAT is part of categories:

• API CJ-4

• API CG-4

• API CH-4

• API CI-4

Engine Oil Aeration Procedure Equipment and Procedure

	At EOAT hours 1, 5, and 20, the oil is evaluated to determine the amount of entrained air in it

The EOAT 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.

EOAT Results

At EOAT 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.

Each engine oil aeration 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.

EOAT Pass/Fail Criteria

At 20 hours, the maximum allowable amount of air entrained in the oil is 8% for API CK-4, API CH-4, and API CI-4 and 10% for API CG-4.

For more information about the engine oil aeration test capabilities at SwRI or how you can contract with SwRI, please contact Ryan Johnson at rjohnson@swri.org or (210) 522-2892.