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The system is able to test to be sure the correct fluid is in the tank. It needs to be a specific concentration.
Our Passat uses DEF / Adblue. One 5 gallon tank will go about 15,000 miles. Refilling it at the 10k oil changes makes it a non-issue. It works out much better than the non SCR / Adblue system the Jetta & Golf use, and is cheaper to run too!
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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