| abstract |
Oil-soluble dyes which comprise at least one chromophore which is incarcerated, at least partially, within at least one macrocycle have been found to resist thermal and/or chemical degradation and to be useful in lubricating oil compositions, fuel compositions and additive concentrates therefor, for detecting leakage of lubricating oil composition in a lubricated internal combustion engine and may be used for detecting the leakage of lubricating oil composition from one lubricated part of an internal combustion engine to another lubricated part of the engine and/or for detecting the ingress of components from the combustion chamber of an internal combustion engine into the crankcase of the internal combustion engine and/or for detecting. |