All of the above is true. I took Accutane I believe in 2012 and ended my course early 2013, and since then the oil my skin used to produce has drastically reduced.
Your oily skin will reduce after Accutane. If it's still bothersome, you could try taking Fish Oil pills and Vitamin D3, but do that AFTER Accutane, due to it maybe having the possibility of interfering with the drug itself.
Hope I helped.