Method for cooling internal combustion engine with an oleaginous coolant fluid composition

Claim 1

A method for cooling a conventional water-cooled internal combustion engine which comprises circulating within the water coolant system of said engine an oleaginous coolant fluid composition essentially free from water and comprising: (A) a major amount of a lubricating oil having a kinematic viscosity of from about 3.5 up to about 5 cSt at 100° C. and from about 18 up to about 30 cSt at 40° C.; (B) a minor amount of a composition selected from the group consisting of (1) one or more basic metal salts of organic acids; (2) one or more phosphorus containing metal salts; (3) one or more phenolic antioxidants; (4) one or more pour point depressants; and mixtures of two or more of (B)(1) through (B)(4).

Claim 2

A method for cooling a conventional water-cooled internal combustion engine which comprises circulating within the water coolant system of said engine an oleaginous coolant fluid composition essentially free from water and comprising: (A) a major amount of a lubricating oil having a kinematic viscosity of from about 3.5 up to about 5 cSt at 100° C. and from about 18 up to about 30 cSt at 40° C.; (B) a minor amount of a composition selected from the group consisting of (1) one or more basic metal salts of organic acids; (2) one or more phosphorus containing metal salts; (3) one or more phenolic antioxidants; (4) one or more pour point depressants; and mixtures of two or more of (B)(1) through (B)(4).

Claim 18

A method for cooling a conventional water-cooled internal combustion engine which comprises circulating within the water coolant system of said engine an oleaginous coolant fluid composition essentially free from water and comprising: (A) a major amount of a lubricating oil having a kinematic viscosity of about 4.0-4.3 cSt at 100° C. and about 19-22 cSt at 40° C.; (B)(1) a minor amount of one or more basic alkali or alkaline earth metal salts of organic sulfonic acids, carboxylic acids or mixtures thereof; (B)(2) a minor amount of one or more phosphite post-treatment compositions of zinc or cadmium metal salts of the mixture of (i) one or more phosphorus-containing acids of the formula ##STR22## wherein each X is independently oxygen or divalent sulfur, each R is independently an alkyl radical containing from about 3 to about 18 carbon atoms; and (ii) one or more carboxylic acids having the formula R 2 COOH, wherein R 2 is an aliphatic hydrocarbon-based radical; (B)(3) a minor amount of one or more phenolic antioxidants having the formula ##STR23## wherein each R 1 is independently an alkyl radical containing 1-4 carbon atoms; q is 2 or 3 with the proviso that said R 1 radicals are in both positions ortho to the phenolic hydroxyl group; (B)(4) a minor amount of one or more pour point depressants; (B)(5) a minor amount of one or more demulsifier compositions; and (B)(6) a minor amount of one or more antifoam compositions; with the proviso that components (B)(1) through (B)(6) constitute from about 0.05 up to about 2.5% by weight of said coolant fluid composition.

Claim 19

A method for cooling a conventional water-cooled internal combustion engine which comprises circulating within the water coolant system of said engine an oleaginous coolant fluid composition essentially free from water and comprising: (A) a major amount of a lubricating oil having a kinematic viscosity of about 4.0-4.3 cSt at 100° C. and about 19-22 cSt at 40° C.; (B)(1) a minor amount of one or more basic alkali or alkaline earth metal salts of organic sulfonic acids, carboxylic acids or mixtures thereof; (B)(2) a minor amount of one or more phosphite post-treatment compositions of zinc or cadmium metal salts of the mixture of (i) one or more phosphorus-containing acids of the formula ##STR22## wherein each X is independently oxygen or divalent sulfur, each R is independently an alkyl radical containing from about 3 to about 18 carbon atoms; and (ii) one or more carboxylic acids having the formula R 2 COOH, wherein R 2 is an aliphatic hydrocarbon-based radical; (B)(3) a minor amount of one or more phenolic antioxidants having the formula ##STR23## wherein each R 1 is independently an alkyl radical containing 1-4 carbon atoms; q is 2 or 3 with the proviso that said R 1 radicals are in both positions ortho to the phenolic hydroxyl group; (B)(4) a minor amount of one or more pour point depressants; (B)(5) a minor amount of one or more demulsifier compositions; and (B)(6) a minor amount of one or more antifoam compositions; with the proviso that components (B)(1) through (B)(6) constitute from about 0.05 up to about 2.5% by weight of said coolant fluid composition.