Is DEF heat sensitive? Given that the DEF tank is under the hood, it must not be very sensitive. I have a significant space under the hood vacant where an auxiliary battery is optional, would be ide

Asked by Jun 12, 2019 at 01:43 PM about the 2018 Mercedes-Benz Sprinter 2500 144 V6 High Roof Crew Van 4WD

Question type: Maintenance & Repair

Is DEF heat sensitive?  Being in a tank under the hood as it is consumed
implies not at least over a short term.  Could it be stored in a container under
the hood then?

1 Answer

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I own a 2012 Roadtrek RS Adventurous, a Class B RV, with two 6 volt deep cycle batteries under the hood....and the DEF tank is also under the hood....no problems at all. DEF is not heat sensitive otherwise the tank wouldn't be there.

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