Your diesel emissions fluid (DEF) helps reduce the emissions and the black carbon that comes out of the tailpipe. Here we have the Grand Tour which is equipped with a 150 gallon tank so you will use three gallons of DEF fluid in that tankful as your DEF will use approximately a 50/1 ratio.
Your tank is monitored by an indicator gauge inside your coach. When the green bar changes to yellow, that means you have 10% left in your tank. To learn more about where to fill out your tank and what happens if you run out of DEF watch the video tutorial below.
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