There will be lots of opinions on this. My preference is a synthetic oil, 10/30 and I add a Zinc additive for the cam. I use premium filters such as K&N, Mobile 1 or Delco synthetic. With the consolidation of the oil industry, a Mobile petroleum engineer has told me that.there are 3 base oil manufacturers left, then the additives are combined with that. I don't pound my cars, therefore I feel comfortable with normal synthetics like Mobile 1, QS, Valvoline. For the price I dont buy the "high end" like Royal Purple, although I did find that marked down to $20 a gallon at Meijer and bought some. Now deciding which car gets that without the others finding out and getting jealous:)