For years, AdBlue® has been part of daily life for anyone running heavy diesels in Australia. Now the move to Euro VI-equivalent standards under ADR 80/04 is lifting the stakes. If you manage a fleet, buy new trucks or run a workshop, it is worth understanding what has changed and what it means for how you buy, store and dispense AdBlue.
From ADR 80/03 to ADR 80/04
Australian Design Rule 80 sets exhaust emission limits for heavy vehicles. The earlier ADR 80/03 was broadly aligned with Euro V, and that is the point at which selective catalytic reduction (SCR) and AdBlue became widespread in Australian trucks and buses.
ADR 80/04 brings Australia into line with Euro VI. It was phased in: first for newly approved heavy vehicle models from late 2024, then for all new heavy vehicles supplied from late 2025. Trucks already on the road are not affected, so most fleets will run a mix of Euro V-era and Euro VI vehicles for many years.
Euro VI sets much lower limits for nitrogen oxides (NOx) and particulate matter than Euro V. It also tightens on-board diagnostics, so the vehicle watches its own emissions system more closely.
Why SCR and AdBlue matter even more with Euro VI
SCR is the main tool most manufacturers use to meet the NOx limit. AdBlue, which is 32.5% high-purity urea in de-ionised water, is injected into the exhaust, turns into ammonia and converts NOx into harmless nitrogen and water vapour. It goes into its own tank, never the diesel tank. You can read the basics on our what is AdBlue page.
What changes with Euro VI is how closely the system is monitored. In practical terms:
- Quality is checked more tightly. Sensors downstream of the catalyst can pick up when NOx conversion drops, which can point back to poor-quality or diluted fluid.
- Running out is not an option. An empty AdBlue tank triggers warnings and, if ignored, a derate or limp mode. A truck stuck at reduced power is a missed delivery.
- Contamination is expensive. Tap water, dust or residue from reused containers can block injectors and filters or damage the catalyst. Repairs on modern aftertreatment systems are rarely low-cost.
None of this is new in principle. Euro VI simply leaves less margin for sloppy handling.
What it means for AdBlue use and supply
AdBlue use typically sits at around 3–6% of diesel use by volume, or roughly 1.5–1.75 L per 100 km for a heavy truck. The actual figure depends on load, terrain, idling and engine calibration, and it can differ between an older Euro V truck and a new Euro VI model doing the same work.
That is why it pays to measure rather than assume. When new vehicles join the fleet, track their AdBlue use separately for the first few months. If your dispensing is set up with a meter or fleet system, this is easy. If not, it is a good reason to add one. Our AdBlue usage calculator gives a starting estimate you can compare against your real numbers.
As more of the fleet moves to Euro VI, the volume you move each month tends to grow. Many operators find they outgrow drums and start looking at IBCs or an on-site tank with scheduled refills.
A practical checklist for fleet managers
- Buy only genuine, certified product. Look for a VDA-licensed AdBlue producer with ISO 22241 compliance and ask for a Certificate of Analysis.
- Keep dispensing gear dedicated. Use AdBlue-compatible materials such as stainless steel, HDPE, polypropylene and EPDM, and never use equipment that has held diesel, oil or coolant.
- Protect stock from heat. AdBlue lasts longest stored below 30°C and out of direct sun. Heat breaks the urea down, and an ammonia smell is a warning sign.
- Hold safety stock. The late-2021 shortage showed how quickly supply can tighten. A few weeks of buffer on site is sensible insurance.
- Brief your drivers. Make sure they know which cap is which, what the AdBlue warning looks like and who to call if it comes on.
One thing you can do today: pull the last month of AdBlue receipts or meter readings and divide by diesel use for the same period. If the result is well outside the 3–6% range, look for leaks, recording gaps or a vehicle that needs checking.
How Liquidia can help: Liquidia makes VDA-licensed, ISO 22241-compliant AdBlue in Australia, with every batch lab-tested. For growing Euro VI fleets we supply IBCs, bulk tanker deliveries and on-site tanks with remote monitoring through our bulk and on-site service, and you can read more about why AdBlue pays its way.