Why do vacuum pumps need oil? Do vacuum pumps increase horsepower?What are the two types of pumps?What is vacuum techniques?

Why do vacuum pumps need oil?

Why do vacuum pumps need oil?

Why is it so important to change the oil often in my vacuum pump? The proper oil in a vacuum pump acts as a blotter and absorbs all of the moisture and non-condensables. As the oil becomes saturated with these
contaminants, the efficiency of the pump is dramatically reduced.

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