just thought i'd update. i've been running mobil delvac 50 in the G56, changed it out the other day and added some 9200 in the mix. shifting seems quite a bit smoother and almost refined. before it was a fairly smooth shift anyway, but in order to not take forever between gears you had to have the timing just right. now it seems to have more forgiveness in the timing of shifting as well as almost just falls into gear.