About two weeks ago, I replaced my nighttime moisturizer with Marula Oil at the suggestion of the Sephora employee who had to deal with my (quite evident) aggravation upon learning that they no longer carry REN skincare in-store. Aggravation notwithstanding, I am so glad they didn't have it because I think this has been the most advantageous skincare change I've made since I started using REN cleanser a few years ago. (I still use that cleanser, by the way, and I can't recommend it highly enough. I also still use their amazing daytime moisturizer during the summer.)
Marula Oil is, I learned, the only naturally moisturizing oil that also contains natural antibiotic properties. This explains, of course, how it manages to moisturize while preventing blemishes, decreasing pore size, and overall, improving my complexion. It is not at all greasy; in fact, the reviews indicate that a substantial number of people use it as their makeup primer because it soaks in and mattifies within about 30 seconds. I haven't tried that yet because inasmuch as I do believe that a high percentage of my recent breakouts were due to over-drying and over-exfoliation on my part, I'm still not yet comfortable with spreading layer after layer of moisturizer on my combination/oily skin.
I use Marula Oil in conjunction with philosophy's Miracle Worker eye cream and Astara's Blue Flame Purification Mask (about once or twice a week), and so far, I'm a convert.