Using a hot oil treatment?

I have very dry and naturally curly hair. When I wash it and condition it, I normally just use hair grease on it. Every so often I put a relaxer in my hair. I would like for it to be bouncy, shiny, and silky smooth. Would the hot oil treatment help my hair? How long is it before I start to notice a difference? Do I add the treatment before or after I wash my hair?