Good conditioner - but greasy strong after

I have been to several colorations relatively dry and vulnerable hair. The Swiss-o-Par argan oil hair treatment works wonders here and makes my hair again "juicy" and shiny. The whole would in itself be great if the effect would not be reversed the next day: my hair look greasy and unwashed un then even though my hair stay fresh normal for very long. The cure is therefore for me not to use ... Too bad!