Diesel Exhaust Fluid. Been frequenting this forum for a couple years now and i don't recall ever seeing much discussion on the topic.

so i'm throwing it out there.. I don't have any practical experience with the stuff but i do know generally what it is.

What is it good for?
Could a system be installed after market? Why would one want to do that?

Discussion GO!

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"