Racing
Track and competition oil, which is a different thing from a road oil that happens to be thick.
Mobil 1 Racing in 0W-30 and 0W-50, Rally Formula 5W-50, Racing 4T for motorcycles, and Supercar 0W-40 to dexos R. These are formulated for sustained high oil temperature and high shear, and several are labelled for track use rather than street use. Read the container before you run one on the road.
