I am using Pennzoil Platinum in my vehicles and it works great. I use Yellow bottle in some of my OPE, again, works great. Ultra to me is a bit over priced. Although a UOA of Ultra after almost 8K miles has been posted at BITOG and the TBN is over 5! Should be good for at least 10K.
I am happy with Platinum at 5K intervals minimum.
Dave