Walk into any truck stop or parts store and you'll see containers labelled AdBlue®, AUS 32, DEF or diesel exhaust fluid. They are all meant to be the same thing: 32.5% urea solution made to ISO 22241. But only some of them are made under a VDA licence, and that's worth understanding before you choose a supplier.
Who the VDA is and what "AdBlue" means
The VDA is the German Association of the Automotive Industry, the body representing German vehicle manufacturers. AdBlue is a registered trademark owned by the VDA. It isn't a generic name for the fluid; it's a brand that the VDA licenses to producers who meet its requirements.
That means a company may only sell product as "AdBlue" if it holds a VDA licence. Other producers can still make and sell AUS 32 or DEF, and some of it may be perfectly good, but they can't use the AdBlue name. When you see the name on a pack from an unlicensed source, that's a red flag in itself.
What a licence involves
A VDA licence isn't a one-off certificate. Licensees are audited by VDA QMC, the VDA's quality management centre, against ISO 22241 requirements. In practical terms that means a licensed producer is expected to:
- Use raw materials of suitable purity, including technical-grade urea and de-ionised water
- Test product against the ISO 22241-1 limits for urea content, biuret, aldehydes, insolubles and trace metals
- Follow controlled production, filling and handling practices, with compatible materials throughout
- Keep records so batches can be traced
- Stay compliant over time, as audits recur
So the licence tells you more than "this product was tested once". It tells you the producer's process is subject to independent, ongoing checks.
Why it matters to fleets and workshops
Poor quality AUS 32 rarely fails in an obvious way on day one. The harm usually builds up: minerals and metals deposit on the catalyst, injectors partially block, filters load up, and eventually a warning light or derate arrives. By then it can be hard to say which delivery caused it, and repair costs can be significant.
Buying licensed product doesn't remove every risk, because contamination can still happen on your own site. But it takes the biggest unknown, the product itself, out of the picture. It also helps if you ever need to show that you used the fluid your engine maker specified.
For service stations and resellers, the licence matters for another reason: selling product under the AdBlue name that isn't licensed misuses a registered trademark.
How to check a supplier's licence
You don't need to take anyone's word for it. A few simple checks will tell you most of what you need:
- Ask for the licence number. A licensed producer will have one and should give it to you without fuss. Liquidia's VDA AdBlue licence number is 0005569.
- Check it against the VDA's list. The VDA publishes a list of AdBlue licensees. Search for the company name and check the details match the business you're buying from.
- Look at who actually makes it. A reseller may sell licensed product made by someone else. That can be fine, but the licence belongs to the producer, so find out which producer's product is in the container.
- Ask for a Certificate of Analysis. A batch CoA showing results against ISO 22241-1 limits is good supporting evidence. Certificates and data sheets are on our resources page.
- Check the packaging. Look for the AdBlue® name with the registered mark, batch number, production date and the producer's details. Missing batch information makes tracing a problem much harder.
One thing to do today: pick up whatever AdBlue container is on your shelf or in your yard, note the producer's name and batch number, and look them up. If you can't identify the producer or find a batch number, raise it with your supplier before your next order.
Licence versus "meets ISO 22241"
Many labels say "meets ISO 22241". That's a claim by the seller. A VDA licence means the claim is backed by audits. Both licensed and unlicensed product should meet the standard, but only one has had that independently checked on a recurring basis.
How Liquidia can help
Liquidia manufactures AdBlue in Australia under VDA licence No. 0005569, with every batch lab-tested and a Certificate of Analysis available on request. See our VDA and ISO certification details or check current pricing on the price list.