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Diesel Exhaust Fluid (DEF) - To drain or not to drain
Do we need to drain the Diesel Exhaust Fluid (DEF)? I was advised that we should drain it completely, and then replace it with brand new fluid. My vehicle has over 100K of mileage on it.
Is it necessary? As per the vehicle's design, DEF is used after combustion, so I don't see the point of why we need to replace the fluid. I understand why we need to have the DEF fluid, but throwing away what I currently have for the sake of having a new batch doesn't make sense to me.
Thoughts?
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