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 exceed Porsche's min 3.5 cSt HTHS vis @ 150C. 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. If you need a slightly lighter oil with exceptional wear performance, consider Swepco 306 15w40 or Brad Penn's newest 10w40 synthetic motorcycle oil which are both available from LN Engineering. For shipping outside the continental 48 states, please call us at 815-472-2939 to place your order.