I have seen this on a few trucks. What is it?

 

It's a diesel that does not have a SMARTY on it... J/K It's just saying that it's good for the planet, thats all.

 

Blue-Tech is the Mercedes technology Diesel Particulate Filter/ regeneration system that the new Dodge Cummins equipped trucks have. All three manufacturers have some version of this afterburner type system on their diesel models.
Mike
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Marketing for people. Just like the "C" on the side of your fender.

 

here is a video on what blue tech is
click on link

http://microsites.mbusa.com/microsit...eos.jsp?open=1