I looked up the thread. A TBN of 7.2 after 6000 miles is good (Amsoil) - that's a measure of the alkaline reserve left in the oil - it means that after 6000miles the Amsoil still had as much ability to absorb future combusiton acids as a typical new ****** oil!
I also like the 0W/30 viscosity - nice and thin - great for power and economy.... the only unknown is the film strength as that affects wear resistence.
The best oil I have ever used is Oil Extreme. I've written about it before so I won't repeat it all here - but it reduced a seasons racing from replacing parts every race day (av. cost $2000 per day plus fuel and tires) to an entire season on no breakages - in ANYONES book that is pretty good for simply changing the brand of oil!
After I stopped sponsoring the car (part of deal was I supplied Oil Extreme) Mark picked up Redline as sponsor - that too has proven reliable - but still requires regular maintenance every other meet, plus requires a lot more frequent changes than when on Oil Extreme. Redline threatened to withdraw sponsorship if OE got added to their oil so Mark chose to keep the free Redline oil deal and pay the maintenance - which is still 200% better than maintenance on the old 50W racing Quaker State.
Oil Extreme do an additive, they also do their own 0W/30 oil.
www.oilextreme.com The film strength is around 260-270,000psi.... more than double anything Mobil or any of the other "7 sister oil companies" have made.
I changed from Mobil 1 15/50 to 0W/40 and improved economy 12%. Then added Oil Extreme additive and got another 18% on top! The noisy tappet went away too (not bad on 0W/30). The TBN went from 8 to 26!
Ask the labs how many oils they have seen with a 26TBN.... they'll likely laugh at you. An additive bottle of OE concentrate has a TBN of 320 - the big Oil Companies still do not know how to do that while providing super-high wear protection and low friction etc at the same time....
Skeptical? fair enough.... but consider this - give me one example of where anything that exceeded its peers by a wide margin ever became mainstream. The best ideas never do, nor do the worst, mainstream is always middle of the road... funny eh?