No need to hassle with DEF on this truck. Its pre-DEF but you still get the massive torque and power from the 6.6 L turbo duramax engine paired to an Allison transmission. This is a great truck for the price! As you can tell for the miles this truck is well taken care of. Interior is in great shape. AT TIMBERLINE AUTO ITS ALWAYS EASY TO FIND A GREAT DEAL! FOR MORE INFO AND A FREE AUTO CHECK REPORT CONTACT ONE OF OUR FRIENDLY SALES STAFF AT (208)523-4000 OR (208) 523-1053 TO ARRANGE A TEST DRIVE. COME SEE US AT 1580 E. LINCOLN RD OR 1235 N. WOODRUFF AVE IN IDAHO FALLS,IDAHO. TO VIEW ALL OF OUR INVENTORY AND GET DETAILS ON OUR PAY IT FORWARD PROJECT 2018 PLEASE VISIT US AT WWW.TIMBERLINEAUTOSALES.COM.