Originally Posted by Z K
Unless you get an official word from Castrol, it's all just marketing. Castrol has no incentive to change the formulation of the oil as there are very few buyers of the oil and we're pretty much a captive group anyway.
at first i thought the same thing..
but not according to this...
Motorsports and Professional have different SAE standards... not sure if professional are now the new oil or improved oil..