Has anyone noticed any difference between Eastern and Western Diamondback oil? How does it compare to Coral oil? Are any of them as good as Copperhead or Cottonmouth oil?
Edit:
The oil clearance of our engines has been designed to a particular viscosity. If you are not increasing the output - and hence operating temperature - of the engine, you need to stick with the manufacturer recommended viscosity. It might be biased for fuel efficiency over peak performance, but unless you're in the fast group on the track day it's unlikely you'll be troubling the performance parameters of the stock oil. If you are upping the output and/or fully exploiting the performance on track days, you might wish to investigate oils that have a higher viscosity when hot. But, that it.
HTH