![]() ![]() Here, the industry found that additive technology overwhelmed all other parameters, and a single Sequence IX test in an SAE 0W-20 formulation can cover all other base stocks in all ILSAC viscosity grades. An example is the new Sequence IX engine test for lubricants effect on the engine-crippling phenomenon called low-speed pre-ignition. Not an easy task.įor some tests, base stock has almost no impact, and BOI/VGRA is solely determined by additive technology. ![]() VGRA attempts to find the viscosity grade that presents the most severe conditions to allow an additive technology to read to all other viscosity grades. The basic premise for BOI is that the industry seeks the most severe test conditions, which can allow a formulator to run an engine test and reasonably apply the result to other base stocks. ![]()
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