First I like to say I agree with bourne on his comments.
I have heard more time than not that Valvoline isn't a long drain oil, yet everyone is willing to dump it when TBN is 2 or more, just because they read on here it's not extended drain oil and the add pack doesn't seem as robust as other oils, yet it has shown to have some of the lowest wear numbers and viscosity retention. As we know Tbn retention is not linear. I have run Napa Synthetic(more or less valvoline synpower) for 6,000 miles with a TBN of 2.9 with very little makeup oil. My car no matter what oil I use, burns 3/4qt at 6,000 miles. I would push it more , but i'm under warranty, I say Valvoline Synpower or Pennzoil Platinum is more than enough for 6,000 miles. Like DNEWTON would say, " Any named brand Dino could do that."