Sequence IIIF Test Method

The Sequence IIIF Test is a fired-engine, dynamometer lubricant test for evaluating automotive engine oils for certain high-temperature performance characteristics, including oil thickening, varnish deposition, oil consumption, and engine wear.

Engine oils tested include both single viscosity grade and multi-viscosity grade oils that are used in spark-ignition, gasoline-fueled engines, as well as diesel engines. The Sequence IIIF Test utilizes a 1996 General Motors Powertrain 3800 Series II, water-cooled, 4 cycle, V-6 engine as the test apparatus. The Sequence IIIF test engine is an overhead valve design (OHV) and uses a single camshaft operating both intake and exhaust valves via pushrods and hydraulic valve lifters in a sliding-follower arrangement. The engine uses one intake and one exhaust valve per cylinder. Induction is handled by a modified GM port fuel injection system setting the air-to-fuel ratio at 15:1. The test engine is overhauled prior to each test, during which critical engine dimensions are measured and rated or measured parts (pistons, camshaft, valve lifters, etc.) are replaced.

The Sequence IIIF Test incorporates a 10-minute operational check, followed by 80 hours of engine operation at moderately high speed, load, and temperature conditions. The 80-hour segment is broken down into eight 10-hour test segments. Following the 10-minute operational check and each 10-hour segment, oil samples are drawn from the engine. Kinematic viscosities of the 10-hour segment samples are compared to the viscosity of the 10-minute sample to determine the viscosity increase of the test oil.

Sequence IIIF Test Method Services
The Sequence IIIF Test is operated at the following test states during the 80-hour portion of the test:

ParameterSet Point
Engine Speed3600 r/min
Engine Load200 N × m
Oil Filter Block Temperature155 ° C
Coolant Outlet Temperature122 ° C
Fuel Pressure365 kPa
Intake Air Temperature27 ° C
Intake Air Pressure0.05 kPa
Intake Air Dew Point16.1 ° C
Exhaust Back Pressure6 kPa
Engine Coolant Flow160 L/min
Condenser Coolant Flow10 L/min
Air-to-Fuel Ratio15.0:1
Condenser Coolant Outlet Temperature40 ° C
 
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