DEF - What is it and how do you use it

What is this stuff (diesel exhaust fluid) and why you need it.  Diesels made since 2010 require this for emission control and will go into a limp mode if you run out.  How far can you go without re-filling? Peak Blue DEF date code revealed

• #howto_style
• #def
• #winnebago_sprinter
• #winnebago_view
• #navion
• #diesel_exhaust_fluid
• #diesel_engine
• #peak
• #blue_def
• #blue_def_date_code
• #walmart_def