Question

how lubs is produces

Answer 1

lube are produced during contractions of auricles

Answer 2

Typically lubricants  contain 90% base oil (most often petroleum fractions, called mineral oils) and less than 10% additives. Vegetable oils or synthetic liquids such as hydrogenated polyolefins, esters, silicones, fluorocarbons and many others are sometimes used as base oils.

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