One thing to remember depending on your state mine being california...there is a mandatory 7-8 year warranty on all emission related parts for tier 4 diesel engines like these. Everything SCR and DPF related is covered for 7 years 100,000 miles and including turbo. The SCR tank and injection is covered for 8 years. This may be something you want to look into on your truck....I'm not normally one to worry about something but I did also buy an extended warranty with this truck 7yr 100k mile bumper to bumper....just in case I work for a Case tractor dealership who are both owned by fiat hence same SCR technology on their equipment the tractors had a few issues from the start in 2011 mostly Nox sensors but I will say the best thing for these engine systems to do is RUN and not be baby'd around. Try and get Temps up and keep them up. The Def crystallizes in the catalyst chamber when there is not enough temp to atomize it cleanly.