WHAT IS DIESEL EXHAUST FLUID AND WHY DO I NEED IT?
Basically, Diesel Exhaust Fluid is an emission control agent designed to neutralize harmful emissions and help improve air quality. In January of 2010, the US Environmental Protection Agency implemented emission standards for medium- and heavy-duty vehicles. We recommend visiting discoverdef.com
for more information. Their article, What is DEF?
is a nice summary and definition of DEF.
Low DEF levels can cause vehicle speeds to be throttled and even cause refusals to start-up. Don't let DEF slow you down!