A lubricating oil composition, containing a base oil (A), a metal-based detergent (B), and a molybdenum compound (D), the lubricating oil composition having a content of molybdenum atoms derived from the molybdenum compound (D) of 0.05% by mass or more, a base number of 4.0 mg KOH/g or more, and an HTHS viscosity at 150° C. of 1.3 mPa.Math.s or more and less than 2.3 mPa.Math.s.

This invention relates to polymer-based partially-open, hollow reservoirs in the nano-size to micro-size range that encapsulate an additive, which can be released from the reservoirs using specific event stimuli such as reduction-oxidation and voltage change, or at will, using the same stimuli. This invention also relates to method preparing such reservoirs, and for releasing the additive. This invention further relates to matrix that comprises such reservoirs and the method of preparing such matrix. This invention also relates to applications, for example in corrosion inhibition, lubrication, and adhesion, that benefit from using such a controlled release of an additive.

A crankcase lubricating oil composition for the crankcase of a spark-ignited or compression-ignited internal combustion engine, comprising a magnesium-containing detergent, in an amount sufficient to provide from 200-4000 ppm magnesium to the lubricating oil composition, in combination with an oil-soluble or oil-dispersible molybdenum compound in an amount sufficient to provide from 600-1500 ppm molybdenum atoms to the lubricating oil composition, and with an oil-soluble or oil-dispersible boron-containing compound in an amount sufficient to provide from 200-600 ppm boron atoms to the lubricating oil composition to improve the friction and fuel economy performance.

A crankcase lubricating oil composition for the crankcase of a spark-ignited or compression-ignited internal combustion engine, comprising a magnesium-containing detergent, in an amount sufficient to provide from 200-4000 ppm magnesium to the lubricating oil composition, in combination with an oil-soluble or oil-dispersible molybdenum compound in an amount sufficient to provide from 600-1500 ppm molybdenum atoms to the lubricating oil composition, and with an oil-soluble or oil-dispersible boron-containing compound in an amount sufficient to provide from 200-600 ppm boron atoms to the lubricating oil composition to improve the friction and fuel economy performance.

This invention relates to the use of a metallic or non-metallic detergent which is a hydrocarbyl-substituted salicylic acid or a derivative thereof in a non-aqueous lubricant composition as an inhibitor of lead corrosion associated with ashless, organic ester, anti-wear additives and/or friction modifiers.

Disclosed is a lubricating oil composition capable of having a good balance of electrical insulation, seizure resistance and wear resistance. In particular, the lubricating oil composition comprises: (A) a lubricant base oil; (B) an alkaline earth metal detergent; (C) a triazole-based compound represented by the following general formula (1) or (2): ##STR00001##
wherein R.sup.1-R.sup.6 are as defined herein; (D) at least one sulfur-containing compound selected from the group consisting of a sulfur-containing heterocyclic ether compound and a sulfide compound; and (E) an ashless dispersant.

The addition of mixed thio acid amide molybdenum dithiocarbamates to lubricant compositions comprising magnesium detergents and/or overbased magnesium detergents, e.g., overbased magnesium sulfonate, provides lubricant compositions that suppress Low Speed Pre-Ignition and possess excellent low friction characteristics. Furthermore, the addition of molybdenum based friction reducing additives, e.g., mixed thio acid amide molybdenum dithiocarbamates, in combination with one or more fatty acid 2-hydroxyalkylamides, to lubricant compositions comprising magnesium detergents or overbased magnesium detergents provides lubricant compositions that suppress Low Speed Pre-ignition and possess excellent low friction characteristics.

The addition of mixed thio acid amide molybdenum dithiocarbamates to lubricant compositions comprising magnesium detergents and/or overbased magnesium detergents, e.g., overbased magnesium sulfonate, provides lubricant compositions that suppress Low Speed Pre-Ignition and possess excellent low friction characteristics. Furthermore, the addition of molybdenum based friction reducing additives, e.g., mixed thio acid amide molybdenum dithiocarbamates, in combination with one or more fatty acid 2-hydroxyalkylamides, to lubricant compositions comprising magnesium detergents or overbased magnesium detergents provides lubricant compositions that suppress Low Speed Pre-ignition and possess excellent low friction characteristics.

Disclosed herein are marine diesel cylinder lubricating oil compositions comprising (a) a major amount of one or more Group II basestocks, and (b) a detergent composition comprising (i) one or more alkaline earth metal salts of an alkyl-substituted hydroxyaromatic carboxylic acid having a total base number (TBN) greater than 250, and (ii) one or more high overbased alkyl aromatic sulfonic acids or salts thereof; wherein the aromatic moiety of the alkyl aromatic sulfonic acids or salts thereof contains no hydroxyl groups; and wherein the marine diesel cylinder lubricating oil composition has a TBN of about 5 to about 120.

A product resulting from the reaction of at least: a hydroxybenzoic acid, optionally substituted by a hydrocarbyl group, or an alkali and/or alkaline earth metal salt thereof, a boron compound, a polyalkylamine component selected from triamine and tetramine compounds. Also, a lubricant composition including this product. Use of this product as a lubricant for two-stroke marine engines and four-stroke marine engines, more preferably two-stroke marine engines.