Your application of oil will vary, so I'd just say try a little at a time and see what works for you.
I don't find that a light application (to the ends when wet) attracts dirt per se
, but if I'm doing the slather thing, it'll be, well, oily.
But then again, I'm applying a heavy coat (slathering) for protection and in that case certainly braiding it up so who cares? If anything a thick application of oil will slick back the short hairs and keep that stuff out of my face. If I'm racing I will grease my head ;-) and braid it back tight.
I don't find that it takes more soap to get out, not the food oils, anyway. I love shampoo bars, and I get mine from Chagrin Valley. Not cheap but easily transportable, go a long way, I like them for boat purposes especially
BTW olive oil is also highly recommended although I'm not that all about the scent. You can, though, add a few drops of essential oil to your hair oil and get a more pleasant scent.
I can't imagine that oil would colour your hair in any way, but I'm a brunette and I expect I wouldn't know if it did.
I don't know if y'all are familiar with the Long Hair fora, but they're a wealth of info on care and also on ***hair toys!!!***
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I think that was all your questions, yes?