Combination Dry/Oily Hair

[lulabyte]

My hippie friend has shoulder-length hair that he straightens the hell out of and it's fairly oily at the scalp, but dry and damaged closer to the ends.  He doesn't shampoo every single time he washes his hair, but he did today and it's still nasty.  Haha!  He usually conditions every time he washes his hair and he USUALLY washes his hair every day.  Ish.

Any product/treatment recommendations for this kid?  Thanks guys!