The Sequence IVA Test Method measures engine oil's ability to inhibit camshaft wear.
The Intertek test engine is a Nissan 2.3L, 3 valve per cylinder, 4 cylinder engine. The crankcase oil is subjected to 100 hours of continuous engine running, cycling from an 800 rpm idle period to a short 1500 rpm stage, and back again, 100 times, under very precise control of operating conditions. At the end of the test, the camshaft is removed and measured for wear. Each of the 12 camshaft lobes is measured in 7 places, and an average lobe wear is computed for the test.
This test replaces the wear measurement portion of the Sequence VE test.