Originally Posted By: Roadkingnc
Living in nascar country, I once worked with the engine builder of a well known race team that had a major oil company sponsorship. They didnt use the sponsors oil in thier engines. The builder would only use mobil 1 in their engines. Team owner had a nhra team too
Hmm the same thing a friend who studied race engines in England, told me about F1 racing, even if they had Castrol sponsorship they were still using M1