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Just traded in my 08 DRW for 2020 SRW, have owned Diesels for ever, but this is my first one with DEF. The salesman said not to fill the DEF all the way, only go to 3/4 full. I asked why, he said that is what he was told that on Rams you only fill it to 3/4. And this is at a Ram Dealership. The...