Hmm... yeah, warm oil, like jojoba from the health food store, probably wouldn't hurt, but our amazing Knotty Boy Dreadlock Conditioning Sprays are specifically designed for these exact mature-lock issues, plus are wayyy easier to use than attempting to apply hot oil to your head. (Kind of a scary thought, no?) Mature locks are typically quite dry anyway, so I wouldn’t be overly concerned as long as you are caring for them properly. Next time you see someone with healthy-looking dreads, ask if you can feel them to compare texture, etc. to try and determine whether or not you should be concerned about their condition.