Just put Schaeffers 7000 15-40 in the truck a couple hundred km ago. Seems to run a bit smoother, injectors are a bit quieter and it may have helped reduced my lope issues a bit. I ran over on my last change of T6 a little bit so it's hard to tell what new vs. new would be like.
I was however very surprised to see that the 7000 was cheaper than what I have been paying for Rotella T6 (5-40). I think the 9000 would have been pretty much spot on with what I get Rotella T6 for. Roughly $25/gal for T6, and $20/gal for 7000. After I use up the next two changes worth I bought, I may try the 9000.