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  1. Mixing different brands/manufacturers of DEF

    RAM 1500 Diesel Maintenance
    I commonly see DEF from Valvoline and Peak at my local Napa Auto Parts store. Since purchasing the truck, I've only used Valvoline DEF, nothing else. Whom here can share their opinion on my scenario?: My DEF tank is approximately 1/2 full with Valvoline Premium Blue DEF. My local NAPA has...
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