Brad Penn, Joe Gibbs, Hughes Engines and Valvoline ZR1 Racing oil are all good. I'm sure there are others I am missing as well. Any brand name oil is fine as long as you use Hughes Extreme Pressure additive or Comps additive or something equal to that. We do not suggest adding EOS or some of the other straight Zinc additives because, in our experience, it does not blend well when added to the oil after it leaves the manufacturer. (Just our opinion) This is why we like the soluble moly. It seems to blend very well and stay in suspension.
Kevin