Where to find all the light oil weapon upgrades for Hollow Knight: Silk

Do you plan to pass Hollow Knight: Silk? You don't seem to cause much damage early in the game. However, as you go on a campaign, you will surely find items that will strengthen your attack while fighting your enemies.

Where to find all weapon upgrades in Hollow Knight: Silk – Pale Oil Position Guide

Upgrading melee weapon The Needle requires a material called light oil. These kingdoms are spread throughout the class. Once you have them, you can hand them over to an NPC called Pinmaster Plinney to improve the damage of the gears.