Good grief!! Just read the owner's manual and follow that as your guideline. Manuafacturer's IBs are always conservative but they do know their powerplants.
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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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