treeshaker Posted May 6, 2012 Share Posted May 6, 2012 Doing more research on the new SD wondering do you have to use DEF all the time? How long does a tank last? Does it affect fuel mileage? Quote Link to comment Share on other sites More sharing options...
DozerUSMVMC Posted March 8, 2013 Share Posted March 8, 2013 Well I did my research and YES you need to use it and here is why... 1) when the DEF tank is 1/2 full (around 4k miles) you will get your only "nice" warning... 2) when the DEF tank get within 500 miles of being empty, the computer puts a speed restrictor on your truck 3) when you get to 50 or a 100 miles from empty the truck gets put in a valet mode haha Now I have never seen this or heard of anyone personally that has had it happen to them but when I was researching the build on my new F250 6.7L, this is what I found most sites saying. #3 might be a different mileage to shutdown, I cant remember exactly Quote Link to comment Share on other sites More sharing options...
DozerUSMVMC Posted March 8, 2013 Share Posted March 8, 2013 Doing more research on the new SD wondering do you have to use DEF all the time? How long does a tank last? Does it affect fuel mileage? Oh sorry I didnt see the rest of the question...the fuel is injected at the exaust fumes so it has no effect on power or milage (again this is research on the internet) the ford website says that it lasts approx 8k with average driving. You can refill 2 gallons at a time at the "1/2 full prompt" and 2 gallons costs roughly 18-20 bucks at the autopart store Quote Link to comment Share on other sites More sharing options...
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