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Diesel exhaust fluid (DEF), commonly referred to as AdBlue in Europe, Australia, and New Zealand, and standardised as ISO 22241 is an aqueous urea solution made with 32.5% high-purity urea (AUS 32) and 67.5% deionized water.

It's readily available in Europe in retail and commercial quantities.
 

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I like the safety aspect of diesel fuel, if you get a leak from a pipe in an accident your less likely to get cremated in your car.

Petrol/gasoline evaporates at normal ambient temperatures so the quantity in your tank is always reducing even when not being used, and the flammability of petrol vapour is well known.

Diesel doesn't evaporate at normal ambient temperature so no evaporative losses and it's much safer - but there is a downside, there's always a small amount of spillage of both fuels at filling stations and the ground around the diesel pumps become saturated with diesel, even on concrete, so a high possibility of treading it into your car - by comparison, the petrol/gasoline spillages evaporate away leaving no residue - and if you don't use protective gloves the smell of diesel on your hands last all day, even after washing!
 
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