Fuel economy engine oil composition
AssigneeChevron Japan Ltd.
InventorNobuo Ushioda
Life of this patent
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Abstract
The present invention is directed to a lubricating oil additive containing a vicinal diol and a particular detergent blend typically is low viscosity base oils whereby exhibiting improved fuel economy. In this respect, disclosed is a lubricating oil composition comprising: a major amount of base oil of lubricating viscosity; a friction modifier which is selected from the group consisting of C10-C30 alkane 1,2-diols and C10-C30 alkene 1,2-diols; an overbased alkyl alkaline earth metal hydroxybenzoate detergent having a metal ratio less than 3.0; and an overbased alkyl calcium sulfonate or an overbased alkyl calcium hydroxybenzoate having a metal ratio of 3.5 or greater.
Claims15
A lubricating oil composition comprising:
- a. a major amount of base oil of lubricating viscosity;
- b. a friction modifier which is selected from the group consisting of C10-C30 alkane 1,2-diols and C10-C30 alkene 1,2-diols;
- c. an overbased alkyl alkaline earth metal hydroxybenzoate detergent having a metal ratio less than 3.0;
- and
- d. an overbased alkyl calcium sulfonate or an overbased alkyl calcium hydroxybenzoate having a metal ratio of 3.5 or greater.
A lubricating oil composition for internal combustion engines comprising:
- a. a major amount of base oil of lubricating viscosity;
- b. a C10-C30 hydrocarbyl 1,2-diol in an amount from about 0.1 to 3 mass %;
- c. an overbased alkyl (C14-C18) alkaline earth metal hydroxybenzoate detergent having a metal ratio less than 3.0 in an amount from about 0.01 to 0.4 mass % based on alkaline earth metal content;
- d. an overbased alkyl (C20-C28) calcium sulfonate or an overbased alkyl (C20-C28) calcium hydroxybenzoate having a metal ratio of 3.5 or greater in an amount from 0.01 to 0.4 mass % based on calcium content;
- e. a nitrogen containing dispersant in terms of nitrogen content from about 0.01 to 0.3 mass %;
- f. a zinc dialkydithiophosphate in the amount from 0.01 to 0.1% in terms of phosphorous content;
- g. an oxidation inhibitor selected from the group consisting of a phenolic antioxidant or a diphenyl amine type antioxidant in the amount from 0.1 to 7 mass %;
- and
- wherein the mass % is based upon the total amount of the lubricating oil composition.
Dependencies are inferred from the claim text.