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

The Sequence IIIF procedure measures oil thickening and piston deposits under high-temperature conditions and provides information about valve train wear. The test simulates high-speed service under relatively high ambient conditions.

The Sequence IIIF test is part of API and ILSAC oil categories:

• API SL

• ILSAC GF-3

Sequence IIIF Test Equipment and Procedure

A 1996/1997 231 CID (3,800 cc) Series II General Motors V-6 fuel-injected gasoline engine is used.

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. It then operates at 100 bhp, 3,600 rpm, and 155 °C oil temperature for 80 hours, interrupted at 10-hour intervals for oil level checks.
 

Sequence IIIF Test Results

At test end:

• All six pistons are inspected for deposits and varnish.

• Camshaft and lifters are measured for wear.

• Oil screen plugging is evaluated.

• Kinematic viscosity increase (percent) at 40°C is compared to a new oil baseline every 10 hours.

• Wear metals, Cu, Pb, and Fe, are evaluated at this interval.

Sequence IIIF Pass/Fail Criteria

For more information about the Sequence IIIF procedure, or how you can contract with Southwest Research Institute (SwRI), please contact Karin E. Haumann at khaumann@swri.org or (210) 522-6351.

sequenceiiif.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