Its been some time since I last visited the whole concept of engine testing for oils; Im sure that a lot of you are wondering, Why now? Well, theres a lot going on (as usual) in the area, so its time to cover a couple of issues and also do a bit of a lookback at how we got here.
The big issue right now with ILSAC GF-6, the passenger car engine oil upgrade, is the Sequence IVB cam wear test. The history of this particular test and its predecessors is complex. Some of you may not know that the earliest version of the Sequence IV was part of the American Petroleum Institutes first MS Test Sequences, introduced formally in October 1962 at the ASTM International meeting in Los Angeles, California, and it was part of the test protocols for API SC. The Sequence IVA version of the test first shows up in API SL and GF-3, which were introduced around 2001. However, that doesnt mean wear was not being addressed in the interim.