For lubrication oil which is considered as a basis and after adding additives to the final lubricant called based oil . In terms of volume of lubricant it is one of the most important components in the lubricant base oil formulation, on average, 95% up. Some groups, such as hydraulic and compressor lubricant, chemical additives and only 1% base oil makes up 99% combined. Other lubricants like metal working fluids, lubricants and gear oils contain additives may be up to 30%.
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