Q8 and T*rc* have the same supplier...not sure if anyone wanna imitate their products coz its only known to car enthusiast like us. however, i have a friend who actually use T*rc* engine oil on his ride n the engine bearing burnt after 2 days! it is a turbo car with over 300hp and the supplier recommend to use the fully syn 10w-30 oil. when my friend ask how this could happen, the oil supplier blamed it on the "worn" out engine (less than 55,000km) and will not compensate anything. since them, my friend sticks to Motul 300V and its fine until now.
myself being using the Q8 oil on my truck since over 2 yrs ago and my truck still doing fine. and yeah, the Q8 doesn't have the seal like Shell or Castro
for me, if u have a fast car n like the fast n furious feeling, don't be stingy on the engine oil. Motul is one of the best around although they r expensive, its worth it.