The Sequence IVA test evaluates a lubricant’s performance in preventing camshaft lobe wear in an overhead camshaft engine. Taxi cab, light-delivery truck, or commuter service is simulated.
Sequence IVA Test Equipment and Procedure
The Sequence IVA test fixture is a KA24E Nissan 1994 2.4-liter, water-cooled, fuel-injected engine, 4-cylinder in-line, overhead camshaft with two intake valves, and one exhaust valve per cylinder.
The test is a 100-hour test of 100 hourly cycles. Each cycle consists of 2 operating modes or stages. Unleaded “Haltermann KA24E Green” fuel is used.
Sequence IVA Test Results
At the end of the test, each of the 12 cam lobes is measured at 7 locations using a surface profilometer, which measures maximum depth of wear. Measurements of wear on all 7 positions of each lobe are added, then all 12 lobe measurements are averaged for the wear result. This result is the primary evaluation for the test.
At 100 hours, the used oil is evaluated for:
Kinematic viscosity
Fuel dilution
Wear metals iron (Fe), and copper (Cu)
http://www.swri.org/4org/d08/GasTests/IVAtest/default.htm
The test proceedure is above. It would be interesting to see the the response from Valvoline...