That is a great history. I met a few members of the Mobil 1 formulation team at an SAE meeting last year. We had some fun discussions about racing formulations.
They now list their 5w20, 10w30 and 5w30 as Racing Oils.
Actually they don't, they just offer them for sale on the same site.
This is written across the top of the listing...
Quote: Mobil 1 Racing oils is designed to maximize performance on the track. Available in a 0W-30 and 0W-50 viscosity, this oil is engineered to deliver outstanding power output while providing boosted levels of anti-wear. Also consider Mobil 1 15W-50 and Mobil 1 0W-40 which are for both road and track use.