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  1. Duramax Sixth Generation: 2017-2019 (L5P)
    Since I'm new to this DEF crap, I need t ask about what I'm seeing in the stores. We were at Tractor supply and they have several different "quality" of DEF. I see the Wallyworld DEF. What's the scoop? Before I need to fill it what do I really need? Also, any specific type of funnel? I have...
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