Olive oil seems to be the most recommended shaving oil outside of specific brands, like Trufitt & Hill.
Honestly, I never have seen the need for oil. It seems it would be messy, it would inhibit glycerin from penetrating the skin, and plenty of shaving soaps and creams provide great slickness. We talk about the best here all the time.
Unless oil softens the whisker even more than water, soap and heat, or it stands the whisker up for easier cutting, I don't get it.
Am I missing something?
Brushless or lather, boys, which ever you've the notion,
fifty cents for shaving cream, a dollar for the lotion; "Old Spice is quality," said the Captain to the Bosun, "so look for the bottle with the ship that sails the ocean!"