Disclosed is a lubricating oil composition which comprises: (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100 C. in a range of about 2 to about 50 mm.sup.2/s, (b) an overbased metal salt of an alkyl-substituted phenate detergent, wherein the alkyl group is derived from an isomerized normal alpha olefin having from about 10 to about 40 carbon atoms per molecule and having an isomerization level (I) of the normal alpha olefin of from about 0.1 to about 0.4 in an amount to provide at least 1000 ppm of calcium, (c) one or more magnesium-containing detergents having about 100 to about 1000 ppm of magnesium, based on the total weight of the lubricating oil composition, and (d) one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol.

An engine oil composition including greater than 50 wt. % of a base oil of lubricating viscosity selected from a Group III, a Group IV or a Group V base oil, and mixtures thereof, 0.1-10 wt. % of a dispersant viscosity index improver that a reaction product of an olefin copolymer, an acylating agent and a polyamine, one or more calcium-containing detergents that provide from about 900 ppmw to about 2500 ppmw of calcium to the engine oil composition, and one or more molybdenum-containing compounds. The engine oil composition has an SAE viscosity grade of 0W-X or 5W-X, wherein X=16, 20, 30, or 40; from about 500 ppmw to about 1000 ppmw of phosphorus; and a total sulfated ash content of no greater than 1.2 wt. %, as measured by ASTM D874. Methods of using the engine oil composition to lubricate or operate an engine are also described.

Use of a guanidinium-based ionic liquid as detergent in a lubricant composition, notably for lubricating marine engines. A lubricant composition including a guanidinium-based ionic liquid.

A lubricant additive concentrate containing 30 to 80 mass % oil of lubricating viscosity and from 20 to 70 mass % of additive; wherein from 30 to 90 mass % of the additive is (i) hybrid overbased colloidal detergent derived from sulfonate surfactant and hydroxybenzoate surfactant; and (ii) polyalkenyl succinimide dispersant derived from a polyalkene having a number average molecular weight (M.sub.n) of from 1300 to 2500 daltons, and wherein the mass ratio of polyalkenyl succinimide dispersant (ii) to hybrid overbased colloidal detergent (i) in the lubricant additive is from 25:1 to 1:1.

A lubricant additive concentrate having a kinematic viscosity of from about 40 to about 300 cSt at 100 C., containing a dispersant-detergent colloid complex, including a polybutenyl succinimide dispersant that is the reaction product of a polyamine and polybutenyl succinic anhydride (PIBSA) derived from polybutene having a number average molecular weight (M.sub.n) of from about 1300 to about 2500 and a terminal vinylidene content of at least about 65%, and succinic and/or maleic anhydride via an ene maleation process, the PIBSA having a succinic anhydride (SA) functionality (F) of greater than 1.7 and less than about 2.5; and a detergent colloid including overbased detergent having a total base number (TBN) of from about 370 to about 1000 mg KOH/g derived from one or more surfactants selected from (i) sulfonate; (ii) phenate; and (iii) carboxylate surfactant; in which the mass ratio of the dispersant to the overbased detergent colloid in the concentrate is from about 0.5 to about 5.0; and the dispersant and overbased colloidal together constitute at least 28 mass %, of the concentrate.

A lubricating oil composition containing a base oil, an organic molybdenum compound, and a metallic detergent, wherein the metallic detergent contains calcium sulfonate, and the content of the calcium sulfonate in terms of calcium atoms is 0.12% by mass or more based on the mass of the composition, the content ratio of molybdenum atoms derived from the organic molybdenum compound to soap groups derived from the metallic detergent based on the lubricating oil composition, [Mo/soap groups], is 0.02 or more at a mass ratio, and the HTHS viscosity at 150? C. is 1.3 mPa.Math.s or more and less than 2.3 mPa.Math.s. The lubricating oil composition has low viscosity and excellent lubricity.

A lubricating oil composition for internal combustion engines is disclosed. The composition exhibits a lower coefficient of friction and improved cleaning properties without causing a deterioration in thermal and oxidation stability.

A low sulfur marine distillate fuel trunk piston diesel engine lubricating oil composition comprising (a) a major amount of a Group I base oil or a Group II base oil or mixtures thereof; (b) at least one or more detergents comprising at least one overbased salt of an alkyl-substituted hydroxybenzoic acid; and (c) a succinimide dispersant derived from polyalkylene having a number average molecular weight (Mn) of 1400-3000; wherein the succinimide dispersant is present at greater than 1.20 wt. % on an actives basis; and the TBN of the composition is less than 30 mg KOH/g.

A zinc free or substantially zinc free lubricant having a sulfated ash content of less than about 1.0 percent and including (a) an oil of lubricating viscosity; (b) 0.03 to about 3.0 weight percent of a phosphite compound; (c) an metal containing detergent; (d) a polyisobutylene succinimide dispersant derived from an ethylene polyamine and having a carbonyl to nitrogen ratio equal or greater than 1; (e) at least one other dispersant; (f) a boron containing compound in amount to provide at least 25 ppm boron to the lubricant composition is useful for inhibiting siloxane deposits in a stationary gas engine fueled by natural gas having a high silicon concentration.

An engine lubricant comprising an oil and additives and method of making and using the same. The engine lubricant is based on process of sequentially combining a specific amount isopropyl alcohol, fuel stabilizer, corn oil and motor oil to produce a lubricant that prevents phase separation. The engine lubricant may be combined with gasoline to produce a two-cycle engine fuel. Alternatively, the engine lubricant may be used to lubricate 4-cycle engines. Prevention of phase separation in the engine lubricant provides longer engine life and reduced engine wear in both two-cycle and four-cycle engines.