I came across information recently that 74% of NASCAR drivers use Mobil 1 oil. I don't know if this is correct or not, but that is what the business brief claimed. Previously, in some of the information I received from Amsoil when I had purchased products from Amsoil, there was some sort of statement to the effect that about 75% of NASCAR drivers use Amsoil. It would be interesting finding out what synthetic oils are actually used in NASCAR racing. Some of the good things about Mobil 1 include that it is available locally, it makes all new car/truck requirments, it is available in multiple viscosities, and now Exxon/Mobil is selling new synthetic blends as well. It is also the motor oil that is put into a considerable number of new vehicles (such as the Corvette).