That is a great looking truck!
I have a VW 3.0 TDI, so my diesel experience is based on that and previously owned older non-AdBlue Dodge Diesels.
First, you can get AdBlue at pretty much every gas station that carries diesel. I wouldn't bother carrying extra around. It's also pretty cheap at Wal Mart, and if in the PNW, Fred Meyer. AdBlue consumption correlates with the mileage you are getting, i.e. if you are using a heavy foot and/or towing, it will use a bunch more. I would guess that when towing, I use almost 2x the normal amount. My AdBlue refill light goes on around 7,000 mi, but at least in VW land you get around a 1,000 mile or so warning.
On another note, many folks who have diesels use some sort of fuel additive for lubricity and water dispersion. You may want to research that for your 2.8 GMC diesel.
Last edited by sigguy; 05/06/19.
