Oil was a type of liquid used for lubrication and medicine. Members of the Lurmen village on Maridun harvested oil from seed pods for nourishment. In certain cases, oil could be weaponized—during the Battle of Coruscant, the astromech droid R2-D2 set oil on fire to defeat a pair of B2-series super battle droids. By 34 ABY, there was a brand of oil meant for droids known as Premium Deluxe D90 Droid Oil. Shisha oil was used by the Toydarian junk dealer Watto, who smoked from a shisha device.
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