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| 2008 to 2010 6.4L Power Stroke Diesel (Disabled) 6.4L Power Stroke Diesel equipped Super Duty. |
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#13
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I have been running on level 3, bumped it up to level 4...saw a mileage improvement over the level 3 and also a power increase. Is it safe to run it all the time on 4 or just keep with the 3?
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