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I've used nothing but Motorcraft oil in my Fords forever and never suffered a lubrication issue. 15W-40 or 10W-30 depending on time of year, where you live dictates that. Over 250K miles on my 1997 7.3, never even had a leak. 184K on my present truck, no issues.
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2010 FZ 405
2011 F350 6.7 Dually w/Banks Power making 510 hp and 1065 ft/lbs torque
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