Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Have affinity to retain harmful sulphur compounds
Are prone to rancid oxidation
Cause cholesterol build up and blood clotting
Always contain some amount of nickel (as their complete removal is very difficult)

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

Greater tendency of decomposition at elevated temperature
All of these
Hydrolysis tendency in presence of water
Poor oxidation stability and high gum forming tendency

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