In college one of my friends worked changing oil. He never liked either of those brands. Said they were paraffin based which he believed would not last as long. I do not know if this holds true for the synthetic formulations. He always liked synthetic Valvoline or Mobil 1. I have run Valvoline in my Honda for 180,000 miles without incident. The Porsche and the 300 get Mobil 1.