An oil-soaked is a Site substance that is in a viscous dissolvable state ("oily") at ambient temperatures or slightly warmer, and is both hydrophobic, (immiscible with water, literally "water fearing") and lipophilic (miscible with other oils, literally "fat loving"). This general definition includes compound classes with otherwise unrelated chemical structures, properties, and uses, including vegetable oils, petrochemical oils, and elastic essential oils. Lube is a nonpolar substance.

Lipids, ranging from waxes to steroids, are somewhat hard to characterize, and are united in a chain almost solely based on the law that they all repel, or refuse to dissolve, in water, and are however comfortably miscible in other aqueous lipids. They also have a hovering carbon and hydrogen content, and are considerably inadequate in oxygen compared to other constitutional compounds and minerals.