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  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:
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