On these trucks I don't really know the magic temp on our lower horsepower tractors we had issues with crystallizing when the Temps dipped below 550 degrees and they had to be run at a high enough load to flow the exhaust fast enough to clear it out...
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...
Times 2 on staying away from oiled air filters they used to gum up my intake and MAF sensor on my old gmc....plus if you let them dry out they don't filter worth a hoot
Typically with the modern computers you may notice very small acceleration difference but that's it...with the computers they are setup to run a certain way and that's it so if you think you are slamming more air in there then my theory is the truck is just going to put more fuel actually...
It doesn't feel like turbo lag it seems more electronic because it's as though the signal is delayed...because it's as though your not hitting the pedal at all....
Thus far I would have to say the air ride and the power train combo...runs and rides so smooth, one thing I have noticed is a pretty significant pause from hitting the pedal to actually going.....not sure if it's normal but the TPS system seems a bit delayed