In good lubricant there some characteristics.
High boiling point.
low freezing point.
High resistance to oxidation and heat.
Adequate viscosity for proper functioning in service.
Non-corrosive properties.
When considering a good lubricant it should have high viscosity index. Not only that their flash and fire points higher than the opperating temperature of the machine.The cloud and pour points of a good lubricant should always be lower than the operating temperature of the machine. And also their volatility should be low.A good lubricant should have proper aniline point.Like that by considering these characters we can identify a good lubricant.
FLASH POINT & FIRE POINT
CLOUD POINT
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