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  1. Duramax Fifth Generation: 2011-2016 (LML)
    I've heard the horror stories about premature DEF heater failure issues. Knowing that GM has extended the warranty on the DEF heater for ten years, didn't really bring me that much comfort. At least mine failed under warranty. After six years and 27k miles my 2015 Chevy DEF heater took a dump...
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