Engine Oils Performance Chemistry

Soft-core and hard-core reverse micelles, RMs The retardation of the decomposition of ZDDP by soft-core and hard-core RMs appears promising for high performance engine oils as shown in Table 3.11. Compare the chemistry of tribochemical films generated by multifunctional soft-core and hard-core RMs systems. 

ABSTRACT Sawdust, shavings, veneer shorn and other fine residues of the woodworking industry ate promising raw materials for production of charcoal. Studies performed at the Latvian State Institute of Wood Chemistry have demonstrated that engine oil refinery acid tar (EORA tar) is a good catalyst of wood carbonisation. Charcoal yield can be increased by 20 to 54 % in comparison with that in the case of non-catalysed pyrolysis charcoal. 

While differences in VI improver chemistry affect pumpability performance, it is emphasized that with good base stocks and proper choice of pour point depressant, engine oils can be formulated to industry standards with any of the currently used chemistries. 

Low-temperature pumpability requirements may become more demanding, and evolution of all chemistries to improve this performance area should be expected. As the automotive and additive industries continue to become more aware of the low-temperature properties of used engine oils, dispersant VI improvers may be designed to prevent the thickening which now occurs at extended mileages. In summary, VI improver developments for the foreseeable future are likely to be evolutionary and market-driven. 

Performance Additives Two-stroke lubricants do not contain conventional antiwear chemistry such as ZDDP, the main reason being the lack of highly loaded surfaces such as cams in the engine. Instead, viscosity alone is the main antiwear component in two-stroke oils, which is driven predominantly by the choice of base oil in the formulation. For the short time that the lubricant is in the engine, it must have sufficient inherent viscosity to prevent the piston assembly from scuff-... 

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