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royal purple
1-4 of 4 Results
  1. 6.4L Performance Parts Discussion
    wondering what oil to get. want the best mileage synthetic i can get. i have also heard that some oil can make more black smoke??? thanks
  2. 6.4L Performance Parts Discussion
    wondering what the best oil is for my 6.4?? is royal purple good? thnaks for the help:icon_ford:
  3. General 6.4L Discussion
    wondering what would be the best oil for the 6.4?? is royal purple good or bad?? thanks for the help:icon_ford::icon_ford:
  4. Royal Purple
    Royal Purple is releasing a new line of motor oil aimed at the street/performance enthusiast market. For several years, the American Petroleum Institute (API) has been reducing the maximum limits of common anti-wear zinc/phosphorus anti-wear additives in motor oils via their self-governed...
1-4 of 4 Results