Gonzo42ExplorerFeb 06, 2014What is it with DEF?Just what is the Diesel Exhaust Fluid (DEF) ? What does it do and why do I need it? This is my first diesel and I never heard of it.
Gonzo42ExplorerFeb 06, 2014Then how would I know whether I am required to use it? I haven't seen anything in the manuals.
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