Oil

Oil is any type of multipurpose liquid substances that share common properties; these properties typically include being combustible, slippery, viscous, and hydrophobic. Individuals who did not get along well could be compared to oil and water. One who worked into the late hours of the day was said to be "burning the midnight oil".

Throughout history, various types of oils can be used to fuel oil lamps, such as those used on the Teplan homeworld. Following the Teplan's contraction of "the blight", oil for these lamps was a precious commodity often used in trades. When Doctor Julian Bashir claimed to seek a cure for the blight in 2372, one of the Teplan inhabitants, Epran skeptically inquired what the cure would cost him, suggesting perhaps "a good coat" or "a tilo of oil." 

Humanoid skin naturally excrete oils from their pores. In 2374, Dejaren, an HD25 Isomorphic Projection, expressed his disgust towards "organics" to B'Elanna Torres, describing to her how she was a "repulsive creature" that is "constantly shedding your skin and hair, leaving your oily sweat on everything you touch." Following the encounter, The Doctor joked, after having relieved Tom Paris from sickbay duties, that he wanted Paris to help him "sterilize every square millimeter of the sickbay," seeing as Paris had "no doubt" left his "oily residue on every hypospray, and your sloughed secretions on every console."

Types of oils

 * Cooking oil
 * Gasoline
 * Hydrogenated soybean oil
 * Kolaish spice oil
 * Petroleum
 * Residic oil
 * Somata oil
 * Vegetable-based oil
 * Xupta tree oil

Items using oil

 * Oil lamp
 * Oil painting
 * Oil pan