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    Castrol Edge 5W-30 Really is Better than Mobil 1

    Well, since this is my first post I figger it might as well be a good one. Please feel free to flame me for lack of white paper to prove that statement. But hey, take your best shot. I just bought a New Silverado with the 5.3 and AFM and I don't know what factory fill was...you don't either if...
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