If you run Euro 5 or Euro 6 trucks, buses, newer tractors or plant, you are already buying AdBlue. The question is whether the fluid going into your tank is good enough to protect a very expensive SCR system. This guide explains what AdBlue does, what goes wrong with poor fluid, how to store it, and what we can show you about the AdBlue we supply from Benoni.
What is AdBlue (AUS 32)?
AUS 32 is the ISO 22241 name for a 32.5 % solution of high-purity urea in demineralised water. AdBlue is the common name in South Africa, and you may also see DEF (diesel exhaust fluid).
How SCR uses it
AdBlue is sprayed into the exhaust ahead of the SCR catalyst, where it turns NOx into nitrogen and water. Euro 5 and Euro 6 engines will not run clean, or at full power, without it.
Which vehicles need AdBlue?
Diesel vehicles with SCR after-treatment: most Euro 5 and Euro 6 trucks and buses, many newer vans and bakkies, and newer tractors and plant. Look for the blue filler cap or check the owner’s manual.
Why AdBlue quality matters
- Wrong strength means faults. Urea outside 31.8–33.2 % trips NOx-sensor and quality faults, warning lights and engine derate (limp mode).
- Metals and phosphate poison the catalyst. Calcium, sodium, potassium, magnesium, iron and phosphate coat the SCR catalyst for good. It cannot be cleaned, only replaced.
- Biuret and dirt block injectors. High biuret and insoluble matter form crystals and deposits in the dosing injector, lines and filters: costly parts and days off the road.
Never top up with water or fertiliser urea
Tap water and agricultural urea carry minerals and impurities that poison the SCR catalyst and block the dosing injector. Only use AUS 32 that meets ISO 22241, from a clean, sealed container.
Our AdBlue: independently lab-tested
A sample of AVDMM AdBlue (AUS 32) was tested by an independent ISO/IEC 17025 accredited laboratory in September 2026. The lab’s verdict: product meets specification for all properties tested against ISO 22241.
| Property | AVDMM AdBlue | ISO 22241 limit |
|---|---|---|
| Urea content | 32.3 % (m/m) | 31.8 – 33.2 % |
| Biuret | 0.28 % (m/m) | max 0.3 % |
| Insoluble matter | 3.2 mg/kg | max 20 mg/kg |
| Phosphate (PO₄) | 0.34 mg/kg | max 0.5 mg/kg |
| Trace metals (Al, Ca, Cr, Cu, Fe, K, Mg, Na, Ni, Zn) | each < 0.10 mg/kg | max 0.2 – 0.5 mg/kg each |
Results apply to the sample tested. Trace-metal and identity checks were run by the same lab outside its accredited scope. See the full results on our AdBlue page.
Storage and handling tips
- Keep containers sealed and out of direct sun.
- Use clean, dedicated funnels and pumps. Never reuse oil or diesel containers.
- Never dilute with water.
- AdBlue freezes at about −11 °C and thaws without harm.
Pack sizes, collection and delivery
5 L packs are in stock at the Benoni yard. 10 L, 20 L and 1000 L IBC are available on order. Tell us roughly how much you use per month and how you store it, and we will quote the right pack. Quote-only, no public prices.
Collect from our Benoni yard, or ask for delivery across Gauteng and surrounds. Route, timing and minimum order are confirmed on the quote.
Pair it with the right engine oil
- AdBlue at AVDMM: lab results and packs
- Caltex Delo, including low-SAPS Delo 400 SLK for SCR/DPF engines
- Trucks and trucks & transport
- Construction and plant · Agriculture
- Diesel Lab
AdBlue quote from Benoni
Fleets, farms, plant hire and workshops across Gauteng and the surrounding provinces buy from our Benoni yard. Send us your monthly volume, pack size and suburb.
Call 011 422 1333 · WhatsApp +27 83 252 0540 · Visit our Benoni counter (27 Liverpool Road, Benoni, Mon–Fri 06:30–17:30)