We do bracket race a 1968 Coronet 440. Believe me, I've read my butt off about this oil. It's worked flawlessly for us. We talked to other bracket guys, a lot of late model guys, engine builders,etc. All seem to praise the oil. I'm not doubting your input one bit. That's why I'm getting a VOA done on the 40 wt. that we run. If it turns out to be inferior, it will be drained and replaced by Shell Rotella T 15w-40.I thank you for your information on the subject.