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It's probably marketing crap. BMW reportedly asked Castrol they wanted a different name for oil sold to them, hence the 'TWS'. So no, you won't find TWS anywhere other than BMW dealers. However, it's supposedly the same oil as the new Castrol Edge 10w/60. A site like bobistheoilguy.com could confirm or deny that, if you're interested. The most important thing is to make sure it's a group IV base stock, like TWS. Finally, I can't find it locally, so will keep ordering it from Tischer once a year for my annual oil change (yes, I like to do it myself).
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