SwRI: Sequence IIIGA test for gasoline engines, API SM, ILSAC G-4

	The Sequence IIIGA procedure at SwRI determines the cold-temperature viscosity performance of an end-of-test (EOT) engine oil sample.

The Sequence IIIGA procedure determines the cold-temperature viscosity performance of an end-of-test (EOT) engine oil sample.

The Sequence IIIGA test is part of engine oil categories:

• API SM

• ILSAC GF-4

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

Sequence IIIGA Test Equipment and Procedure

The Sequence IIIGA 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.

Used Lubricant Analysis

Cold crank simulator (CCS) and apparent viscosity are determined by the 100-hour oil sample.

Sequence IIIGA Pass/Fail Criteria

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