Most instructions I've seen for this method suggest using either pure extra-virgin olive oil ("EVOO") or a mixture of EVOO and castor oil. I recommend starting with a lighter oil like sesame, almond, or avocado.
I do recommend using organic plant oils only. Don't use mineral oil, and avoid non-organic oils if you can.
Many people have asked me about using a variety of oils. I'm including this information on comedogenic (pore clogging) and non-comedogenic (non pore clogging) oils, which is copied from a page on www.soapnuts.com
since that site seems to have gone down. Please note that I have only tried a few of these oils myself. Do your own research and experimentation to find the oil or combination of oils that works best for your skin. Unless you're having a bad reaction, like an allergy, I recommend choosing an oil to start with and using it for at least a month before you switch to something else.
Low Pore Clogging Probability:
Almond (Sweet Almond) oil
Apricot Kernal Oil
Evening Primrose Oil
Medium Pore-Clogging Probability:
Hydrogenated Vegetable Oil
Sulfonated Castor Oil
High Pore-Clogging Probability:
Wheat Germ Oil
Using a small funnel, fill a small container (I use an empty 1-ounce dropper bottle) with your chosen oil. Be sure the bottle is clean and dry. Moisture inside the bottle can cause the oil to mold or go rancid. You can buy these dropper bottles
for around $0.75 to $2.00 each.
I like to add a bit of tea tree oil to my basic oil because I feel like its germ-killing properties help avoid acne breakouts. Some folks use lavender. Just be sure you only add a very small amount - in a little 1-ounce dropper bottle I add 1 or 2 drops of essential oil.