PYB, QSGB, MS5k are all good oils. Depending on where he's buying his oil, he might be able to get a better price on Havoline, Chevron, or Kendall (Kendall is a semi-synthetic).
As long as he gets a quality oil, his vehicles will be protected, so he might as well save a few bucks and get whichever one of the quality oils is cheapest.