When I got my g6et in march I swore by bp as I ran it in my tuned BA and it was great. Ive had a issue with a dodgy idle in the fg from day 1 and had it checked by ford and a tuner nothing wrong no vac leaks etc. 2 weeks ago filled up with vortex 98 and within a hour or so a perfect idle, after that tank tried ultimate again and within a few minutes the idle issue returned, coincidence maybe when this tank of bp is gone ill try the caltex 98 again.