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10w30 is the oil to use for maximum durability and it is what Ford spec'd on these motors originally, they only lowered it to 5w30 later on in an attempt to improve fuel milage.
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55LS, Comp XE264HR-14, Flowtech LT's to 3" single, FRPP Mass Air Conversion, TweecerRT with BE, Innovate LC-1 wideband O2
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