The downside to DEF is not the DEF, it’s the sensors and delivery system that can have issues. Some have never had a problem, others have had several sensor failures that derate or shut down the engine. Varies by year, generally, with post 2016 engines the most commonly mentioned.
Do some searches as there is no single, simple answer.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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