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International Lubricant Standardization and Approval Committee
When a mixture of two or more substances shows physical properties or service performance characteristics, which are inherently inferior to those of either of the individual products before mixing.
Additive that improves the performance of a petroleum product by controlling undesirable chemical reactions, i.e., oxidation inhibitor, rust inhibitor, etc.
Contaminates found in used oils due to dust, dirt, wear particles or oxidation products.
example is the ISO Viscosity Grade system for industrial oils.