Hold the Alt key while hovering over a Notable on the passive tree to see its oil requirements.
Use community resources like the Blight Helper or PoEDB to search for specific passives or tower modifiers. poe-oil-enchants
Adds modifiers to the map, such as reduced monster speed or increased chest rewards. Hold the Alt key while hovering over a
Search the official trade site using the stat filter "Allocates" followed by the passive name to find pre-anointed items. Oil Tiers and Upgrading poe-oil-enchants
The number of oils required depends on the item type being enchanted: