A large "W" next to the letters "NE" that are slightly smaller appear at the bottom of the Peak synthetic bottle. I suspect that means Warren, which probably means that the Peak is very similar to Supertech. Supertech in this area is also made by Warren. I have seen some good used oil analysis using Supertech synthetic. I think Mobil provides Supertech in the southeast. BTW, SuperTech conventional is 2.89 a quart here at Walmart. Sheesh. Anyway, although the idea of using Mobil 1 Extended Performance for 10,000 is good, I am somewhat worried about extended oil changes with the extreme weather that we have in IL combined with the short trips that my vehicles often endure. This is probably irrational, but I think that I am going to stick with 5000 to 6000 mile OCIs. BTW, I read today that some commodities dealers anticipate $145.00 a barrel oil by this summer, so I am going to build my stash before we see $7.00 a quart for dino. Gas is going to be murder.