So what do you guys think is so special about your oils? I never know what to buy because everyone claims their's is best anyway. I've been using Pennzoil 10w30 or Castrol GTX 10w30. I used to run 15w40 Rotella. And I've used 10w40 Royal Purple, still have half a case in the shop. I can get Mobil 1 10w30 easy enough and thought I'd try that. Never had a problem with any of them. Pennzoil 10w30 is in my car now though.
