Zodax diffuser oil is the best youll use. Be patient with the porcelain diffusers vs. reeds. It takes quite a while, much longer than the 24 hours the directions state, to start smelling the diffusion of oil. I usually baste the porcelain first. Pour over a small amount onto the porcelain in a small bowl. Then, I use a pipette to baste the oil over by the dropper-ful. A teaspoon would work fine. Essential oils and fragrance oil are caustic. They will erode plastic! Use a glass or ceramic bowl. Now your porcelain is ready and is primed to uptake the oil and diffuse. I get compliments a lot on my Zodax diffusers.