I wonder if the story of not topping it off is because when doing so, it will overflow to the surrounding are and that stuff is corrosive. Also, on my Chevy, if it barely overflowed, it would end up in the little spout thing and that may be dirty and would find it's way into the tank. And the engine/computer doesn't like dirty DEF!!!
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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