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US 2008/0167207 A1Published application
Lubricating oil composition
AssigneeChevron Japan Ltd.
InventorHiroyuki Nagamatsu
Life of this patent
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Abstract
A lubricating oil composition favorably employable for trunk piston diesel engines contains an overbased sulfurized alkylphenol calcium salt, at least two (preferably three) overbased alkylsalicylic acid calcium salts having different base ratios and hydrocarbyl groups of different carbon atom numbers, a borated ashless dispersant, and a zinc dihydrocarbyldithiophosphate.
Claims15
A lubricating oil composition comprising the below-described additive components dissolved or dispersed in a base oil;
- 1) an overbased sulfurized alkylphenol calcium salt having a TBN of 200 to 300 mg·KOH/g, in an amount of 0.06 to 0.25 wt. % in terms of a calcium content;
- (2) an overbased alkylsalicylic acid calcium salt having a base ratio of 1.8 to 2.5 and one hydrocarbyl group of 14 to 18 carbon atoms, the base ratio being expressed in terms of a calcium content in an overbase portion per a calcium content in a soap portion, in an amount, of 0.05 to 0.7 wt. % in terms of a calcium content;
- (3) an overbased alkylsalicylic acid calcium salt having a base ratio of 4.2 to 5.8 and one hydrocarbyl group of 20 to 28 carbon atoms, the base ratio being expressed in terms of a calcium content in an overbase portion per a calcium content in a soap portion, in an amount of 0.19 to 1.05 wt. % in terms of a calcium content;
- (4) a borated ashless dispersant in an amount of 0.005 to 0.06 wt. % in terms of a nitrogen content and 0.001 to 0.02 wt. % in terms of a boron content;
- and
- (5) a zinc dihydrocarbyldithiophosphate in an amount of 0.01 to 0.1 wt. % in terms of a phosphorus content.
3 more elements
A lubricating oil composition comprising the below-described additive components dissolved or dispersed in a base oil:
- (1) an overbased sulfurized alkylphenol calcium salt having a TBN of 200 to 300 mg·KOH/g, in an amount of 0.06 to 0.40 wt. % in terms of a calcium content;
- (2) an overbased alkylsalicylic acid calcium salt having a base ratio of 1.8 to 2.5 and one hydrocarbyl group of 14 to 18 carbon atoms, the base ratio being expressed in terms of a calcium content in an overbase portion per a calcium content in a soap portion, in an amount of 0.05 to 0.5 wt. % in terms of a calcium content;
- (3) an overbased alkylsalicylic acid calcium salt having a base ratio of 3.6 to 4.5 and one hydrocarbyl group of 20 to 28 carbon atoms, the base ratio being expressed in terms of a calcium content in an overbase portion per a calcium content in a soap portion, in an amount of 0.08 to 1.55 wt. % in terms of a calcium content;
- (4) an overbased alkylsalicylic acid calcium salt having a base ratio of 7.7 to 8.7 and one hydrocarbyl group of 20 to 28 carbon atoms, the base ratio being expressed in terms of a calcium content of an overbase portion per a calcium content of a soap portion, in an amount of 0.1 to 0.7 wt. % in terms of a calcium content;
- (5) a borated ashless dispersant in an amount of 0.005 to 0.06 wt. % in terms of a nitrogen content and 0.001 to 0.02 wt. % in terms of a boron content;
- and
- (6) a zinc dihydrocarbyldithiophosphate in an amount of 0.01 to 0.1 wt. % in terms of a phosphorus content.
4 more elements
Dependencies are inferred from the claim text.