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ad blu systems use EGR as well 2 EGR systems
in VW
the systems that use AD Blu also use 2 EGR systems , hi and low pressure
and
there are heaters for the AD Blu / DEF
because
Ad Blu / DEF freezes like water freezes at near the same temperature
but
if you run low or run out of AD Blu / DEF the system will become angry
if you do not heed the warnings
eventually
on all OEMs that use AD blu / DEF
the engine will not start or run
until you get the system to the dealer to be repaired
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