Ad Blue, Diesel additive

[Joe Bob]

The new to me Mercedes Diesel has a separate filler cap for this additive. https://www.walmart.com/ip/BLUEDEF-Diesel-Exhaust-Fluid-2-5-gal/16933407?wmlspartner=wlpa&selectedSellerId=0&adid=22222222227010184782&wl0=&wl1=g&wl2=c&wl3=67020913849&wl4=pla-150230954449&wl5=9028890&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=online&wl12=16933407&wl13=&veh=sem#about-item

Does this additive go into a separate tank or does it mix in with the Diesel fuel and just has a separate filler hole? How much do you use if it is like a pre mix?

Thanks in advance.

[JJ 911SC]

It has it own container. https://www.youtube.com/watch?v=ezUPuUHGa04

[Arizona_928]

Ad blue is just urea injection, no?

[pete3799]

Separate tank. DEF does not get injected into the motor it is injected into the exhaust.

[manbridge 74]

It is a 50/50 water and urea mix. So do NOT add it to diesel fuel..

[M.D. Holloway]

Diesel Exhaust Fluid (DEF) is one of the key elements involved in the SCR (Selective Catalytic Reduction) process. It is a nontoxic solution of 67.5% de-mineralized water and 32.5% automotive grade urea. DEF helps to convert NOx into nitrogen gas and water vapor. It is stable, non-flammable, odorless, and colorless.
Cold weather, DEF starts to freeze at 12°F. DEF spec is not impacted by freezing and subsequent defrosting.
Hot Weather: Store below 86°F. Exposure to excessive heat for extended time will reduce shelf life (90°F storage reduces shelf life to 6 months)

[manbridge 74]

Porsche claims their piss water is 50/50. And their tank heaters go bad routinely. Which will suck for those whose warranty will soon lapse.

[aigel]

Haha - yes, that would be DEF and it has a separate tank on your vehicle. You can fill up at truck stops or walmart has their tech brand pretty cheap too in 2.5 gallon containers with a nice filler hose included. AFAIK all the DEF is the same in this country and in Europe they call it Adblue.

G

[Rtrorkt]

and if you do it yourself, the warning of low DEF does not reset

[sammyg2]

I double-dog dare ya to add it to the fuel like pre-mix ...... just to see what happens.

[sammyg2]

Don't make me go triple-dog.