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    Mobil1 - 5w-20 vs. 5w-30

    Greetings Wise Ones, This is my first post and I'm currently exploring the site, so please pardon me if this question has been asked a million times. I recently purchased a used 2008 Ford F-150 4x4 with a 5.4L 3-valve Triton engine. Ford's recommendation is to use 5w-20 and I was curious how...
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