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	The Sequence IIIG method measures oil thickening and piston deposits during high-temperature conditions and provides information about valve train wear.

The Sequence IIIG procedure measures oil thickening and piston deposits during high-temperature conditions and provides information about valve train wear.

The Sequence IIIG test is part of engine oil categories:

• API SM

• ILSAC GF-4

The Sequence IIIG test simulates high-speed service during relatively high ambient conditions.

Sequence IIIG Test Equipment and Procedure

The Sequence IIIG test uses a 1996/1997 231 CID (3,800 cc) Series II General Motors V-6 fuel-injected gasoline engine.

Using unleaded gasoline, the engine runs a 10-minute initial oil-leveling procedure followed by a 15-minute slow ramp up to speed and load conditions. The engine then operates at 125 bhp, 3,600 rpm, and 150 °C oil temperature for 100 hours, interrupted at 20-hour intervals for oil level checks.

Sequence IIIG Test Results

At test end:

• All six pistons are inspected for deposits and varnish.

• Cam lobes and lifters are measured for wear.

• Kinematic viscosity increase (percent increase) at 40°C is compared to a new oil baseline every 20 hours.

• Wear metals Cu, Pb, and Fe, are evaluated.

Sequence IIIG Pass/Fail Criteria

 

PASS	FAIL

For more information about the Sequence IIIG procedure, or how you can contract with Southwest Research Institute (SwRI), please contact Pat Lang at plang@swri.org or (210) 522-2820.

sequenceiiig.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