Sequence IVA,IVB

[Fondue]

Hi

Why is the Sequence IVA and IVB test performed at a lower temperature and not at a higher temperature?

Sequence IVB Test (ASTM D8350)

Sequence IVB test method is used to measure the ability of an engine’s oil to control valve-train wear and overall engine wear, at low temperature operating conditions

www.intertek.com

https://www.swri.org/sites/default/files/sequence-ivb-test.pdf

 

[RDY4WAR]

Those tests are specifically meant to look at the oil's performance during cold start and warm up when the oil temperature is below the activation temperature for most additives, especially anti-wear and detergent additives. The IVB test is short duration in bursts kept at low temperature and repeated 24,000 times in 200 hours.

 

[4WD]

Standard Test Method for Evaluation of Automotive Engine Oils in the Sequence IVB Spark-Ignition Engine

Significance and Use 5.1 This test method was developed to evaluate automotive lubricant’s effect on controlling valve-train wear and overall engine wear for overhead camshaft engines with direct acting bucket lifters. 5.2 Average intake lifter volume lo

www.astm.org