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  1. DURATEC Performance (2003-2007)
    Has anyone ever tried a heavier weighted oil in their PZEV Duratec? I feel like with 5W-20 I may as just save money and dump in some vegetable oil, it's SO thin! Obviously Ford recommends it for a reason, and I haven't had any probs for 95,000 miles with it, but I feel like the engine might...
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