Blended oils are the commonly uses liquid lubricants.
They are normally made by using vegetable / animals/ mineral oils.
The blends can be made so that the properties of lubricants get improved to suit the service conditions of the machinery. This is done by using additives.
Blending is essential since no single pure lubricant serves satisfactorily.
Blending agents are used to improve various properties such as viscosity index, oxidation stability, oiliness , pour point etc. blended oil are superior to vegetables and mineral oils.