Hi, I have a forester sti 2001 jap import automatic and I'm planning to change the gearbox oil and I was just wondering what oil should I use and how much will I need? Also I recently did an oil change and used castrol magnatec 5w 30 a1 oil as this was recommended. Is this oil suitable or should I be using something else? If anyone has any suggestions it will be greatly appreciated! Cheers.