I've been told to take a cab since I ask too many questions about oil and can't seem to make up my mind. With that, if I start taking a cab, should I chose a cab that runs on Havoline or Castrol GTX? I was recently reading that motorcraft oil is hydroclear. Havoline seems to be a great performer, is it hydroclear as well? Or does that not make a huge difference in making or breaking an oil?