Marine diesel lubricant oil compositions having improved low temperature performance
AssigneesChevron Oronite Company LLC, Chevron Oronite Technology B.V.
InventorsMia Gill, Wilhelmus Petrus Antonie van Houten
Life of this patent
Estimating the term…
Abstract
A method for improving low temperature performance of a lubricant in a compression-ignited internal combustion engine is disclosed. The method comprises operating the engine with a monograde lubricating oil composition comprising (a) a major amount of a base oil of lubricating viscosity; and (b) a minor amount of an overbased alkaline earth metal salt of an alkyl-substituted hydroxyaromatic compound, the alkyl substituent being a residue derived from an isomerized alpha-olefin having from 12 to 40 carbon atoms per molecule.
Claims12
A method for improving low temperature performance of a lubricant in a compression-ignited internal combustion engine, the method comprising operating the engine with a lubricating oil composition comprising (a) greater than 50 wt. % of a base oil of lubricating viscosity;
- and (b) 3.0 to 40 wt. % of an overbased alkaline earth metal salt of an alkyl-substituted hydroxyaromatic compound, wherein the alkyl substituent is a residue derived from an isomerized alpha-olefin having from 20-24 carbon atoms per molecule, wherein the isomerized alpha-olefin has an isomerization level of 0.1 to 0.4, wherein the isomerization level is a relative amount of methyl groups attached to methylene backbone groups as determined by 1H NMR spectroscopy;
- wherein the lubricating oil composition is a monograde lubricating oil composition meeting specifications for SAE J300 revised January 2015 requirements for a SAE 20, 30, 40, 50, or 60 monograde engine oil, and has a TBN of 5 to 200 mg KOH/g, as determined by ASTM D2896.
Dependencies are inferred from the claim text.