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    Delo 400 SDE in a 6.7 Powerstroke?

    Sorry for the sophomoric question here. I ended up with this 2.5 gallon jug of 15W40 400 SDE on clearance for less than the sticker price. I know it's not blessed with the Ford specifications. My owners manual states to only use API approved symbol/CJ-4 motor oil, which it is. Would you happily...
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