I have one question of curiosity because I do not and will not likely have a Diesel anytime in the near future. I see people say you can get a message like 500 miles to "No Start". Does this mean if the DEF tank runs low, OR there is some level related error that the engine will not start and is locked out due to a lack of DEF?

If this is the case I could clearly see how people would be concerned and upset with the entire DEF system in these cars.

I also wonder if Mercedes or other manufacturers are having similar high rates of failures in the DEF systems or if this is mainly a BMW thing?

Just not a lot of Diesels in my area and I am just trying to understand what the down side of a failed DEF system can be other than increased NOX emissions from the vehicle.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.