I just found in another thread that Fensport's 1120kg Race build Runs this oil
http://www.fensport.co.uk/FensportCars/GT86_Race.aspx. You wont have any issues running it, but you should do a UOA for it and post the results if you end up going that route!
Ive been running Eneos Sustina since my dealer oil changes ran out. It will save you about 30 bucks in comparison to millers, but oil doesnt make too much of a difference if youre just dd'ing. I like Eneos because it doesnt break down as quickly. I usually run it for about 15k before changing it.