| abstract |
The present invention relates to the functional fluid composition that contains friction improver, especially contain the stable composition of following friction improver, described friction improver has limited solubility and/or limited compatibility in the functional fluid that uses them. Especially, the present invention processes the functional fluid for internal combustion engine, for example engine oil, and the friction improver that contains one or more amide functional groups, wherein friction improver with otherwise can cause composition content unstable and/or preformed casse to be present in functional fluid composition. |