When does DEF fluid go bad.
Due to unforeseen circumstances, I've had DEF fluid in my rv system for about a year now because the rv hasn't been driven and may sit for a few more months. When do I start to worry and have to drain...
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Thanks guys for the good info. Think I'll take and use info from everyone. I'll wait a bit and not worry about the age of the DEF but if I find that I'm gonna be homebound for an extended period of time I'll siphon it all out.
