| abstract |
The present invention relates to a lubricating oil composition comprising (a) more than 50% by weight of a lubricating viscosity base oil; and (b) from 0.1 to 40% by weight of an overbased alkaline earth metal alkyl substituted hydroxyaromatic carboxylate, the alkyl substituent being a residue derived from an isomerized alpha-olefin having from 12 to 40 atoms of carbon, and having a TBN, on an active ingredient basis, less than 600 mg KOH / g, as determined according to ASTM D 2896. The lubricating oil composition is a monograde lubricating oil composition in accordance with descriptions of SAE J300 requirements modified in January 2015 for SAE 20, 30, 40, 50 or 60 single-grade engine oil, and has a TBN of 5 to 200 mg KOH / g, as determined by ASTM D2896 . |