So, I've been buying my oil, filters, grease, etc from Walmart for years. Valvoline MaxLife synthetic blend oil, and Fram filters. Regular ordinary orange box. I did switch from the general purpose grease to the multi complex, or whatever they call it. The red stuff. Am I practicing false economy here? Should I be buying AC Delco or Napa filters, and name brand grease? Every time I'm in Napa, I look at that oil filter comparison display and think maybe I should switch. Any thoughts?