this section describes how:the perfomance of lubricants, especially in critical applications, is largely dependent upon the quality and composition of the base oilquality of base oil influenced by origin of crude oil feedstock, type of refining and sever of processproperties of lubricants can be modified and improved by judicious choice of supplementary additives additives combinations are selected with care to ensure maximum perfomance and economic benefits International oil companie with extensive reseach facilities acquire considerable. expertise in the development and application of lubricant additives
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