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Question
What is oiliness? What is its importance in lubrication?
Solution
Oiliness of a lubricant is the measure of its capacity to stick on to the surface of machine parts under condition of pressure or load. When a lubricating oil of poor oiliness is applied under high pressure, it gets squeezed out from the surface and the lubrication stops. If the oil has good oiliness it can remain in place and can give lubrication even under pressure. Mineral oil has very poor oiliness whereas vegetable oils possess good oiliness. No direct test are available for measuring oiliness.
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