Different oils are fine

I have used walnut oil, almond oil ( my favorite), grapeseed oil. They worked all just the same as olive oil, just soooo much easier to swallow.
And yes, I have also experimented with different quantities of oil. Found that 1/2 cup oil mixed with 2/3 cups juice worked best for me. I tortured myself only twice hoping that more oil would procuce even better results, but that was not the case.