Mobil 1 HM or Castrol Edge Titanium? Trying to decide on which one for my cars. I have a 05 Chevy Malibu 2.2 94,000 miles and 04 Jeep Liberty 3.7 100,000. No oil burning or leaks. I have been using the M1HM and using the Chevy's oil life computer, I got 9,000 miles OCI this last time. I've heard the Castrol Titanium is really good, but is it better?