If you have a late model diesel powered motorhome, there’s a good chance it requires the usage of Diesel Exhaust Fluid, aka DEF. In this segment Robert Hitt of Prevost explains why DEF is needed and provides solid information on using DEF correctly.
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I travel the Alaska Hwy where DEF is $25+ per jug. I’ll carry a couple with me, stored in a plastic container.
I RECENTLY LEARNED THAT THERE IS APPARRENTLY A SHELF LIFE ASSOCIATED WITH DEF AND THAT PEOPLE SELLING THIS PRODUCT FROM PEAK WERE SOMEWHAT VAGUE ON WHAT THIS ENTAILED IN TERMS OF AN ACTUAL TIME PERIOD. I WAS E-MAILED A SOMEWHAT COMPLICATED MEANS OF IDENTIFYING MFG. DATES THAT MIGHT HAVE WORKED IF THE DATES WERE NOT OBSCURED BY SHIPPING LABELS! I GAVE ALL SIX JUGS AWAY AND RECEIVED A VERY COURTEOUS AND QUICK REFUND FROM AMAZON .
DEF is not something you want to let run dry. On my 2011 Ford 6.7L diesel, if I run the tank dry, the computer will eventually slow me to a maximum of 5 miles per hour. Check your owner’s manual to make sure you know how the system works. As well, I find buying in bulk at the truck stops, the cost of DEF is 1/2 the cost of buying it in the jugs.