From http://www.intellidog.com/dieselmann/64bulletin.htm:
6.4 EGR valve and particulate filter (DPF) failures due to high sulfur fuel:
The 6.4 PowerStroke is designed to run on ultral low sulfur diesel (ULSD) fuel, which has no more than 15 PPM sulfur content. Using high sulfur fuel (greater than 500 PPM sulfur) can cause corrosive damage to the EGR valve and DPF. Use of high sulfur diesel can cause emission system component malfunction and cause the check engine light to come on. Broadcast Message 0346.
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'08 F-350 XLT (Job 3) 4X4 6.4L PSD CC SRW LB, Line-X bedliner, UWS toolbox, Goodyear Wranglers (Silent Armor), Marathon seat covers, Edge Insight
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