Remember old school Kendal GT-1? Well this stuff is even better, blended with hydrocracked group III base stock. Brad Penn has a high 10+ TBN and plenty of ZDDP (anti-wear additives) to keep your engine both clean and well protected. Excellent High Temp High Shear Viscosity for all grades. In fact, Brad Penn 20w50 has a 6.8 cSt HTHS @ 150C, which is higher than Amsoil and Mobil 1 in the same viscosity! If you are considering Brad Penn 20w50 for your race car, you may want to consider using Brad Penn Racing 1 SAE50 monograde oil. As far as 20w50 viscosity oils come, Brad Penn is what I use and recommend most. For shipping outside the continental 48 states, please call.