There are several places in the Ember Valley region that contain Primordy Oil, but the best locations are among the coral cliffs. Ride the geysers to reach higher vantage points so you can get a ...

You can get a Pale Oil for completing the Great Taste of Pharloom quest in Silksong, which you find in the dining rooms on ...

There are basically two ways to obtain a map of Hollow Knight: Silksong, and they depend on the region you are in.