stonefox
11-28-2010, 05:28 PM
Maybe you are wondering what the heck is DEF. Well its Diesel Exhaust Fluid....... for those of you running diesels in your series you may want to look into this if you want your truck to be compliant with the 2010 emission standards. What next head light fluid.... Muffler bearings... Fluxcapacitators:eek: