Blackmouth Oil

Blackmouth Oil is an alchemical ingredient used for the creation of various action-related potions.

Gnomes like to use Blackmouth Oil as a lubricant for their machinery, especially springs. It is also noted to be extremely flammable.

Source
Blackmouth Oil can be crafted using Alchemy (80); this recipe is taught by Alchemy trainers.

Enchanting

 * Enchant Gloves - Fishing