I don't actually know but I suspect its something like: 
The coolant leaks into a chamber thats a bazillion degrees during regeneration, 
the water boils out of the coolant and the resulting "stuff" is hot enough to 
ignite.

-Curt

    On Wednesday, October 24, 2018, 2:53:30 PM EDT, Randy Bennell via Mercedes 
<mercedes@okiebenz.com> wrote:  
 
 So, the engine overheats when the coolant leak becomes an issue and that 
causes the soot to ignite?

RB

On 24/10/2018 1:37 PM, Curt Raymond via Mercedes wrote:
>  It says the fire is around the exhaust filter which is where soot gets 
>burned up, presumably it gets really hot in there...
> -Curt
>
>    


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