How much amount is the safe amount to add adblueinto diesel tank?

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How much amount is the safe amount to add adblue
into diesel tank?
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INTRODUCTION

• Even as little as 0.5 liters can damage the
  engine. 
• It is important to address the issue quickly to
  minimize the damage.
• In the worst case, the vehicle could be written
  off due to the parts and labor costs to replace
  the entire fuel system and engine. In the best
  case, the fuel filter should be replaced after
  flushing and replacing the contaminated fuel.
•  Call wrong fuel fixer assistance to help your
  car engine fixed damaged with adblue into diesel.
  
• In general, by mistake he almost never adds
  adblue into diesel tank. AdBlue filler caps are
  designed for smaller nozzles (19mm) and will not
  fit larger diameter diesel nozzles.
• However, reverse path is a common problem for
  drivers of vehicles with newer SCR systems and
  causes costly damage.
• Absolutely avoid such troubles, incorrect
  lubrication, and precious time.

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THANK YOU!