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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

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Old Sep 28, 2017 | 08:24 PM
  #31  
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87crewdually
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My concerns with a 6.0 is after 5k miles the oil is broken, usually with a viscosity 10 points lower.
So that 5w30 oil potentially could be closer to a thin 20w @ operating temps. Too thin in my opinion. 5w40 works fine for me.
 
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