John 2017 and earlier Have a common sensor ,it's only capable of detecting Urea/Nitrogen. So you can run ratio's to 5% Urea/Nitrogen to 95% Dist/DIO water. I ran My 2015, down to that level its entire life I owned My 2015 4.25 Years. 2018+ have quality sensor so 22%+ is needed... 1000s of DEF...