@Styyna! I was actually born with a full head of hair, and kept getting more - hence the three-heads-full aspect of it LOL!
Actually here at Sephora in SF they have Josie Maran's line of argan oil products, so I might be able to score a sample of the oil - it's worth a try!
My hair actually does like some oils. What I do is spritz my hair with water, and work a bit of jojoba oil that has some lavender and rosemary essential oil in it(I got this idea off an expensive salon I used to go to in Santa Fe where the owner formulated her own line of oils for the hair). I also sometimes use my shea butter-coconut oil combo on my hair in the same way - it revives curls, acts as a pre-wash treatment and gives me a day or two before I have to wash. Straight unrefined coconut oil works too. Years ago, before I got into these combos, I used my Sicilian grandmother's idea of leaving olive oil and rosemary on my hair overnight in a cap and then shampooing out in the morning - it did help.
My hair isn't really fine - it's just not coarse, more medium to fine and varying strands too. Some are coarser than others, some are curlier than others so I've got that mix going on. A lot of times, people who really do have predominantly very fine hair need more protein than moisture, and those with somewhat more robust hair textures all the way up to true coarse need more moisture than protein. I need more moisture myself. In fact, my hair cutter recommended for me to only use a deep protein reconstructor product maybe once a month, and the deep moisture treatments once a week or so. So it ends up with me doing the reconstructor just before coloring which works out fine.
Anyhow, as with skin, what counts is what works on one's hair! We curly-heads often have temperamental hair and it takes some trial and error to get the right combo. Fortunately my right combo right now is actually pretty cheap, a plus.