complexity in Group II and even Group IV Base Oils that are not so simple.
Group III Base Oil Interchange is complicated because these Base Oils contribute to test performance. Market leaders in additive and Base Oil technology speak out about the difficulties of Group III BOI and the significant performance impact that different Group III Base Oils have on specific engine tests.
This situation is made more complex as base oil characterisation tests are weak. The test methods defining Group III oils do not predict their correlation with engine test performance. Traditional test methods such as the saturates and sulphur standards are not good predictors of the engine performance of these molecules. Without a good correlation to bench tests the only way to know if a Group III engine oil is suitable is to test it in the engine.
In order to be approved, licensable motor oils must demonstrate the ability to pass API/ACEA category test requirements. OEM approved oils often go beyond these industry specifications with still
more demanding performance tests. All components of the tested formulation, including Base Oils, are part of this registration system. Safely getting these tested formulations to market requires industry cooperation.
Without this necessary industry cooperation there are risks inherent in a weakly supported BOI/VGRA read-across programme. It is easy, perhaps, to say that cars aren’t falling off the road because of poor choices in Base Oils interchange or faulty viscosity reads, but that’s a pretty low standard. We know that engine performance degrades over time when protection fails. In this circumstance control tolerances are lost, volatility stresses the oil, deposits build up reducing performance and causing wear in the engine leading to a loss of fuel economy. Working outside tested BOI/ VGRA guidelines is improvising without supporting data.
So in conclusion, regulation is pushing OEMs to new technologies demanding high performance and low viscosity Group III Base Oils. Modern Group III oils are demonstrably contributors to engine test performance and their
performance in engine tests is poorly modelled by bench tests. API and ATIEL Base Oil Groups were created to provide safe interchange guidelines in an age of carbureted engines and solvent refined Base Oils. New base oil manufacturing technology is creating more complexity in high VI Base Oils and actually making it harder to create good Base Oil interchange guidelines. The challenge will not be getting easier.
LINK
www.neste.com
who can benefit from light color, low odor sulfurized EP additives?
you can.
Sun Chemical and its parent company, the DIC Corporation, provide light color and low odor sulfurized extreme pressure additives globally. DAILUBE EP additives are used in industrial and metalworking fluids for cutting, forming, rolling, grease and more. For more information, call us today or visit our website:
www.sunchemical.com.
working for you.
www.sunchemical.com
Europe +49-211-16430 Americas +1-973-404-6600 Asia Pacific +65-6224-0600 Japan +81-3-6733-6165
advancedmaterials@sunchemical.com
SUNCHEMICAL is either a registered trademark or a trademark of Sun Chemical Corporation in the United States and/or other countries. DIC and DAILUBE are trademarks of DIC Corporation, registered in the United States and/or other countries. Copyright © 2017 Sun Chemical Corporation. All rights reserved.
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