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Most 5.4L owners I've talk to say their tucks use about a quart every 1200 miles or so(is normal). If it's more than that any you don't see any, depending on the miles, it could be worn rings, faulty PCV valve, valve seals, valve cover gaskets( leaking near the back).

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11y ago
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Q: What could cause 2006 f150 with 5.4 to burn oil?
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