| 摘要 |
The present invention is directed to a method of cooling an internal combustion engine comprising circulating in the cooling system of an engine, operating at a temperature of at least 140°C, an effective amount of an engine coolant comprising a liquid alcohol freezing point depressant, a C5 to C16 carboxylic acid or salts thereof. In preferred embodiments, oxidation of liquid alcohol based freezing point depressants in high temperature applications is suppressed by use of one or more aliphatic monocarboxylic acids or the alkali metal, ammonium or amine salts thereof in combination with dicarboxylic acids or alkali metal, ammonium or amine salts thereof and triazoles and/or, optionally, imidazoles.
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