Use of a lubricating composition

Abstract

The present invention relates to a method for advancing the spark timing of a spark-ignited internal combustion engine, the method comprising lubricating the spark-ignited internal combustion engine with a lubricating composition comprising base oil and an anti-knock additive, wherein the anti-knock additive is an aromatic amine.

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         6 . A method for advancing the spark timing of a spark-ignited internal combustion engine, the method comprising lubricating the spark-ignited internal combustion engine with a lubricating composition comprising base oil and an anti-knock additive, wherein the anti-knock additive is an aromatic amine. 
     
     
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         9 . The method according to  claim 6 , wherein the lubricating composition comprises from 3 to 20 wt % of the aromatic amine. 
     
     
         10 . A method for advancing the spark timing of a spark-ignited internal combustion engine, the method comprising a step of adding an anti-knock additive to the lubricating composition used to lubricate the spark-ignited internal combustion engine, wherein the anti-knock additive is an aromatic amine. 
     
     
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         13 . The method according to  claim 10 , wherein the step of adding an anti-knock additive to the lubricating composition comprises (i) fuelling the spark-ignited internal combustion engine with a fuel composition comprising a base fuel and an anti-knock additive, wherein the anti-knock additive is an aromatic amine, and (ii) transfer of anti-knock additive during operation of the engine from the fuel composition to the lubricating composition. 
     
     
         14 . The method according to  claim 10 , wherein the aromatic amine is selected from aniline and alkyl-substituted aniline compounds, 1,2,3,4-tetrahydroquinoline, diphenylamine and alkyl-substituted diphenylamine compounds, 2-ethylhexyl-4-(dimethylamino)benzoate, indoline, N,N-dimethyl-1,4-phenylenediamine, o-toluidine, p-toluidine, p-anisidine, p-phenetidine, and mixtures thereof. 
     
     
         15 . The method according to  claim 6 , wherein the aromatic amine is selected from aniline and alkyl-substituted aniline compounds, 1,2,3,4-tetrahydroquinoline, diphenylamine and alkyl-substituted diphenylamine compounds, 2-ethylhexyl-4-(dimethylamino)benzoate, indoline, N,N-dimethyl-1,4-phenylenediamine, o-toluidine, p-toluidine, p-anisidine, p-phenetidine, and mixtures thereof.