The act or an instance of oil pulling

Light crude oil contained in petroleum-bearing formations of low permeability, often shale or tight sandstone.

plural of oil cake

(engineering) Automatically lubricating itself with oil while in operation.

An oil produced from almonds.

A perfumed oil used in dressing the hair.

A cosmetic product used to moisturize the beard and the skin beneath it.

plural of oil tanker

(Asia) Illicit cooking oil that has been recycled from waste oil collected from restaurant fryers, slaughterhouses, sewage, etc.

plural of oil-down