For some people, oil alone is not a good moisturizer; it can dry the hair out if a water-based leave-in or conditioner isn't used first. Often instead of oil, I use Qhemet Olive & Honey Hydrating balm. Honey is a wonderful humectant.
Karen's Body Beautiful Ambrosia is really nice for remoisturizing on dry hair. I also like Qhemet Burdock Root Butter cream.