Marcosvg

Good afternoon, I am considering the possibility of changing the approved adblue model that I use for total clearnox adblue or similar, someone has tried adblue with an additive, do you have any experience in this regard, I appreciate any help.

rapidoxidation

Adblue by any other name would still be adblue.
I wouldn't put ANY additives in adblue.

Teckno

Hopefully some good news. We never let our AdBlue drop below 50%. Top up with quality AdBlue that is recently made and stored in a cool place. 50Km into a 125km trip the error message activated, 15 min later the display said 800km range till engine shuts down. Got to destination, stayed there 5 hours and commenced return journey. Still no level detected and 800km range reducing by 120km when we returned. Got quotes for new tank - $3400, 4 month back order from Germany, no stock. AdBlue delivery pump - $$1800, in stock. Nox sensors x 2 _ $1650 each.
Risk the tank, pump or sensors has been disabled due to crystallisation in tank.
Research let to some manuf, all overseas who sold a AdBlue additive - used in AdBlue tank. Selected brand “Forte” and preferred option, 125ml services 20l tank Benz tank is 27l.
Car rested for 4 days, battery charger connected to top up battery in case electrical knock on ??
Ordered “Forte” Exhaust Crystal Preventer from UK, DHL Express delivery, arrived in Oz6 days later.
1 x bottle dispensed, sat for 3 hours. On starting engine alert still on dash. AdBlue tank now seeing virtually full tank - 700km range gone, no messages on screen except for engine light - I suspect it will go when error codes cleared.
Drove GLC at 100kph for 30 min ,rested car 2 hours and returned @ 100kph for 30 min. No more issues !!!
Hopefully this id the golden arrow that fixes the issue. Forte recommend 1 x bottle every AdBlue fill - won me.
Hope this helps.

Rubatoguy

Add Blue is primarily Urea in a diluted solution. If you get enough evaporation in the tank, crystals may form. This is more than likely if your vehicle sees light use or sits for long periods of time. Any tank leaks, or heater failure would also promote this happening. Since the urea solution is alkaline, I would suspect any crystal preventative would be a mild acid. Depending on your vehicle use, it might be worth it to run a crystal prevention solution or cleaning solution now and then.

Teckno

Update to AdBlue issue / warning. (GLC250D)
Bottle of “Forte” in AdBlue tank seems to have worked for me.
1. AdBlue tank is now reading and functioning levels.
2. Warning distance till engine stops and will not restart has gone - car has done this, no OBD11 used.
3. Engine light turned itself off this week - again no OBD11 used.

I might buy an OBD11 unit to analyse car and see if any error codes remain and what they are before deleting them ?

Hopefully cured, will monitor, use another bottle of “Forte” when I top up AdBlue, might wait till tank is 25% remaining
Looking at replacing AdBlue with another brand - “Clearonox or Clearnox” sold here in Australia - it has a crystalisation reducer to stop or minimise the issue.
Combined with “Forte” I am hoping no more concerns.
Might have dodged a $6000 repair bill.