My girlfriend does this once a month! She covers her DRY hair in olive oil, wraps cellophane around it, and just putters around her house for a couple of hours, then washes it out. She swears by it... frankly, I've seen her the day before and the day after and notice nothing different, except I get a craving for pasta
Seriously... I can't see a difference, but she says she FEELS a difference. I've been thinking of trying it myself. If you do it come back and let us know how it worked!! I'll do the same if I try it.