Forum Discussion
sdetweil
Jun 28, 2014Explorer
jim summers wrote:
... Also I'm baffled/troubled by
DEF. I don't have it now & read bad tales about it. Thnx
can't answer the truck questions.
on DEF they discovered if they spray some fluid with the right properties into the hot exhaust after the filter, it will combine with the remaining nitrous oxide (bad) and turn into water and nitrogen (good). doing this means they can run leaner (better mileage, less soot)
DEF Diesel Exhaust Fluid is that formula that works. Urea solution made with 32.5% high-purity urea (AUS 32) and 67.5% deionized water.
I use about 2.5 gals/4000 miles. a little more when towing.
I buy a spare 2.5 gal jug when I see them on sale. Last year towing at a truck stop, it was 2 2.5 gal tanks for $20. (instead of $15 each).
sometimes fill up the def tank at truck stops cause they have a nozzle and cheaper price. (~2.50 gallon)
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