Many of us have been frightened away from using facial oil, but in fact it can be marvelously nourishing and protective. In the summertime my skin seems to be fine without it, but as the weather changes I find it's the perfect natural moisturizer.
I like to use a couple of drops of olive oil after cleansing my skin, while it is still a bit damp. The oil seals in the residual moisture on my skin and protects it from dehydration. Interestingly, I've never experienced breakouts from using the oil, though I avoid using it on very warm days. It takes a couple of minutes of the oil to be absorbed into my skin, and occasionally I'll find I need to blot a bit before applying my foundation.
Grapeseed oil is generally recommended for oily skin, jojoba and olive oil for 'normal' skin, and camellia and rose hip seed oil are rich enough for dry or mature skin. You may find you need to experiment a bit, depending on the state of your skin and current weather conditions. I'd recommend starting with olive oil, though, if you have some handy. It's rich in antioxidents, convenient, and inexpensive. I keep a tiny bottle of it with my other skincare supplies, so I don't have to deal with a huge bottle in the kitchen when I want a few drops.
Have you used oil as a moisturizer? Which oil have you used? Was it beneficial for your skin?