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  1. 6.0L Power Stroke Technical Info
    The guy I bought the truck from had been running 5w40 Mobil 1 for several years. I've been using the same since I've had it but wondering if it would be better to change to the recommended 15w40 on the next change. Any issues with changing viscosity? He had it up in the mountains full time with...
  2. 6.0L Power Stroke Technical Info
    Thanks for the good info in this forum ; I'm still perusing the website. Need help with hard start, no start, rough idle. FICM was replaced ~50K miles ago - at that time bad batteries was the cause. However, bow I'm not confident I've identified the FICM as the source of my problem. When the...
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