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Development of engine crank‐case oil formulations for oxidation stability using indigenously blended lubricant base‐stocks
Author(s) -
Sharma R. K.
Publication year - 1996
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010090106
Subject(s) - crankcase , lubricant , viscosity index , base oil , crankshaft , environmental science , crank , pulp and paper industry , automotive engineering , petroleum engineering , chemistry , engineering , internal combustion engine , materials science , mechanical engineering , composite material , organic chemistry , cylinder , scanning electron microscope
With changing engine design putting more emphasis on fuel economy, emissions control and low engine oil consumption, the quality levels of engine crank‐case oils are changing fast. With this in view, experimental work has been carried out towards the development of engine crankcase‐oil formulations meeting the required levels of oxidation stability. Three lubricant base‐stocks meeting the physico‐chemical characteristics of engine oils, prepared from lubricant streams obtained from different refined crude oils and one re‐refined engine oil base‐stock were used. The viscosity index of these base‐stocks ranged from 84 to 98, and carbon residue from 0.06 to 2.2. The antioxidant used in the formulation was of ZDDP type, and the detergents were calcium and barium sulphonates. The base‐stocks were evaluated using the IIP oxidation stability test, to determine their suitability in the formulation of engine crankcase oils. The base‐stocks were then dosed with additives, and tested again by the IIP Oxidation Stability Bench Test, for their additive response. The final formulations were then tested on a CRC‐L‐38 standard engine test prescribed in Indian Standard 13656:1993 for IC Engine Crankcase Oils with respect to bearing corrosion and piston deposit tendencies. It was observed that higher VI lubricant base‐stocks and the re‐refined engine oil base‐stock gave better test performance in both bench and standard engine tests.