Every vehicle produces certain levels of harmful emission nitrogen oxide (NOx) gasses. The number of vehicles on the roads triggered a need to lower the emission rate of those gases. One of the means to do that is with the introduction of DEF in diesel vehicles. DEF has an impact on the vehicle and maintenance. If you are looking to buy a used Duramax, it is good to know what year did Duramax start using DEF. So, what year did Duramax start using DEF? The first generation of Duramax engines t...
