The invention provides a lubricating composition containing an oil of lubricating viscosity and a N-acylated aromatic amine compound. The invention further relates to methods of lubricating an internal combustion engine by supplying the described lubricating composition to the internal combustion engine. The invention further relates to the use of the N-acylated aromatic amine compound as a TBN booster.

The present invention relates to a lubricating composition containing (a) an oil of lubricating viscosity; and (b) a compound selected from the group consisting of: (i) an ester-containing heterocycle; (ii) an amide-containing heterocycle; and (iii) a pyrimidine, wherein the ester-containing heterocycle and the amide-containing heterocycle have a hydrocarbyl group containing 6 to 40 carbon atoms. The invention further provides for a method of supplying an internal combustion engine with the lubricating composition.

A lubricating oil composition includes: a lubricant base having a kinematic viscosity at 100 C. of 1.0 to 10 mm.sup.2/s and % C.sub.P of no less than 70; (A) 0.1 to 30 mass % of a poly(meth)acrylate viscosity index improver having a PSSI of no more than 5, a weight average molecular weight of 10,000 to 500,000, a ratio A/B of less than 2.4 and a ratio C/B of less than 1.4, the ratio A/B being a ratio of a viscosity increase effect A on kinematic viscosity at 100 C. to a viscosity increase effect B on HTHS viscosity at 150 C., and the ratio C/B being a ratio of a viscosity increase effect C on kinematic viscosity at 150 C. to the viscosity increase effect B on HTHS viscosity at 150 C.; and (B) 0.01 to 2.0 mass % of a friction modifier.

A lubricant composition has an increased oxidation induction time. The lubricant composition includes a base oil present in an amount of greater than 85 parts by weight per 100 parts by weight of the lubricant composition. The lubricant composition also includes an antioxidant component including particular first, second, and third antioxidants.

A lubricant composition including: from 70 to 99.99% of at least one base oil and from 0.01 to 30% of at least one alcohol ethoxylated phosphate ester compound of formula (I): ##STR00001##
wherein R is a linear or branched alkyl group having from 10 to 14 carbon atoms, m is an integer from 1 to 3, preferably from 1 to 2, n is an integer superior or equal to 6. Also, the use of the compound of formula (I) to prevent and/or reduce and/or limit and/or delay corrosion and/or tribocorrosion of the metal parts of a combustion engine.

The present invention relates to a process for regenerating a used lubricant composition, especially used for regenerating an engine drain oil, comprising the steps of: fractionating said used lubricant composition in a countercurrent fractional distillation column with a countercurrent flow of supercritical carbon dioxide (sCO.sub.2), wherein said used lubricant composition and supercritical CO.sub.2 are fed in the countercurrent column with a ratio of the sCO.sub.2 flow rate on used lubricant flow rate ranging from 15 to 50; and recovering the regenerated oil extracted within the supercritical CO.sub.2.

It further relates to a process for preparing a lubricant composition from a regenerated base oil obtained according to the invention.

The present patent application relates to the use, as detergent additive in a lubricating composition intended for a marine engine, of at least one spiro compound of formula (I)

##STR00001## in which M is an atom chosen from boron and aluminum; n1 and n2 have, independently of one another, the value 0, 1 or 2; and R represent, independently of one another, a hydrocarbon group comprising from 1 to 50 carbon atoms, in particular from 5 to 20 carbon atoms.

It also relates to the use of said spiro compound as additive in a lubricating composition intended for a marine engine, for improving the stability to oxidation of said lubricating composition.

Finally, it relates to a lubricating composition intended for the lubrication of a marine engine, comprising one or more base oils and at least one spiro compound of formula (I), and also to a process of lubrication of a marine engine employing such a composition.

This application relates to branched diester compositions that can be used as a base stock for lubricant applications, or as a base stock blend component for use in a finished lubricant or for particular applications, and methods for making the same.

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.

This application relates to branched diester compositions that can be used as a base stock for lubricant applications, or as a base stock blend component for use in a finished lubricant or for particular applications, and methods for making the same.