Australia's Temporary Fuel Standard Change: What 'Dirtier Fuel' Actually Means
The government temporarily raised petrol sulfur limits from 10ppm to 50ppm for 60 days. Here's what that means for your car, your health, and why it's still cleaner than what we were buying three months ago.
You might have seen the headlines — "dirtier fuel" is being sold in Australia. On 12 March 2026, the government temporarily raised the allowed sulfur content in petrol from 10 parts per million (ppm) to 50 ppm for 60 days, to boost domestic supply during the Middle East fuel crisis.
That sounds alarming. But the full picture is a lot more reassuring than the headlines suggest.
The short version
The temporary 50 ppm fuel is still three times cleaner than the regular unleaded most Australians were buying until December 2025. It's not going to damage your car. Here's why.
What changed with Australia's fuel sulfur standards?
Australia tightened its petrol sulfur standards on 15 December 2025 — a genuinely big deal that brought us into line with Europe, Japan, the US, China, and India after years of lagging behind:
| Fuel grade | Before Dec 2025 | After Dec 2025 | Temporary (60 days) |
|---|---|---|---|
| Regular unleaded (91 RON) | 150 ppm | 10 ppm | 50 ppm |
| Premium (95 RON) | 50 ppm | 10 ppm | 50 ppm |
| Premium (98 RON) | 50 ppm | 10 ppm | 50 ppm |
So the temporary 50 ppm limit is:
- Three times cleaner than regular unleaded was for the previous 20 years (150 ppm from 2005 to December 2025)
- The same as premium unleaded was until three months ago
- Five times higher than the new 10 ppm standard
As the NRMA's Peter Khoury put it: "It's the same fuel we were buying 12 months ago and beyond."
Why did the government relax fuel standards?
The Strait of Hormuz disruption has tightened global fuel supply. Australia's Ampol Lytton refinery in Brisbane was producing petrol with sulfur above 10 ppm but below 50 ppm. Under the new rules, this fuel couldn't be sold domestically — so it was being exported.
By temporarily raising the limit to 50 ppm, Energy Minister Chris Bowen unlocked around 100 million litres per month of extra domestic supply. That's roughly two additional days' worth of national petrol stocks — meaningful during a supply crunch, especially for regional areas where shortages have been most acute.
Ampol committed to prioritising this redirected supply for regional communities, primary producers (farmers and fishers), and the wholesale spot market that supports independent fuel distributors.
This came alongside a coordinated release of 400 million barrels from strategic reserves by 32 International Energy Agency member nations — the largest emergency release in the IEA's 52-year history.
Will dirty fuel damage my car?
No. Not for 60 days at 50 ppm.
Modern cars have three main emissions components that are sensitive to sulfur: the catalytic converter, the gasoline particulate filter (GPF), and the oxygen sensors. Here's what happens at different sulfur levels:
At 10 ppm (the new standard): Everything works as designed. Maximum efficiency from all emissions control systems.
At 50 ppm (the temporary level): The catalytic converter's efficiency drops somewhat — sulfur compounds coat the active catalyst surfaces, reducing their ability to clean exhaust gases. However, this effect is largely reversible. When the car reaches normal operating temperature, a process called "desulfation" burns off much of the accumulated sulfur. Once we return to 10 ppm fuel, the systems recover.
At 150 ppm (what regular unleaded was until December 2025): Particulate filters are effectively disabled. The catalytic converter operates well below its design efficiency. This is the level Australia lived with for two decades.
The key point: 50 ppm for a few weeks is what every Australian car ran on until very recently. It's within the design tolerance of the entire existing vehicle fleet. The NRMA confirmed that this temporary measure "is not going to hurt your car."
For context, Volkswagen Group had previously restricted gasoline particulate filters on certain Australian models (like the Skoda Superb Scout and Karoq Sportline), stating these filters could only withstand fuel with up to 50 ppm sulfur. That's the temporary level — not 150 ppm.
Is higher sulfur fuel bad for your health?
This is where there's a real trade-off, even if it's a small one.
Sulfur in fuel produces sulfur dioxide (SO2) when burned. SO2 irritates the respiratory system and reacts in the atmosphere to form fine particulate matter (PM2.5) — tiny particles that penetrate deep into the lungs. People with asthma, children, and older Australians are most sensitive.
The government's own "Better Fuel for Cleaner Air" review estimated the 10 ppm standard would deliver $6.4 billion in health and environmental benefits by 2040. The estimated health benefit from bringing the standard forward by 2.5 years alone was $840 million in reduced air pollution costs.
A 60-day reversion to 50 ppm won't undo those benefits, but it's not zero-impact either. Energy analyst Tristan Edis noted that increased sulfur emissions "can worsen respiratory and cardiovascular conditions." The government described the environmental impact over 60 days as "non-zero but unmeasurable for harm."
It's a pragmatic trade-off: a small, temporary increase in emissions in exchange for keeping regional fuel supply flowing during a genuine crisis.
Why was Australian fuel so dirty compared to other countries?
Australia's fuel quality history is... not a proud one. Here's the timeline:
| Year | What happened | Regular unleaded sulfur |
|---|---|---|
| 2002 | First fuel quality standards introduced, leaded petrol banned | 500 ppm |
| 2005 | Tightened to Euro 3 equivalent | 150 ppm |
| 2008 | Premium grades tightened | 150 ppm (premium: 50 ppm) |
| 2009 | Diesel drops to 10 ppm | 150 ppm (unchanged) |
| 2009–2025 | Nothing changes for petrol. For 17 years. | 150 ppm |
| Dec 2025 | Finally aligned with Europe, US, Japan, China, India | 10 ppm |
| Mar 2026 | Temporary 60-day relaxation | 50 ppm |
For perspective, here's when other countries reached 10 ppm sulfur in petrol:
- Japan: 2007
- European Union: 2009
- United States: 2017
- China: 2019
- India: 2020
- Australia: 2025
Australia was 16 years behind Europe and even behind China and India. During those years, car manufacturers couldn't bring their cleanest, most fuel-efficient engine technologies to Australia because the fuel couldn't support them. The Federal Chamber of Automotive Industries stated that "poor fuel standards in Australia relative to regions such as Europe and Asia have meant that some car companies have been unable to introduce some of the world's best fuel efficient and environmentally friendly technologies."
The eventual fix cost the government up to $250 million in refinery upgrade subsidies (split between Ampol Lytton and Viva Geelong — Australia's only two remaining refineries) and added an estimated 0.6–1.0 cents per litre to the fuel price. On a 50-litre tank, that's 30–50 cents — barely noticeable against the 30–40 c/L swings that happen daily from normal market volatility.
Do I need to do anything differently at the pump?
No. You can't choose your fuel's sulfur level — it's blended into the supply chain before it reaches the pump. You'll fill up the same way you always do, at the same stations, paying the same price.
The practical impact for drivers:
- Your car is fine. Every car on Australian roads today ran on fuel with this much sulfur (or more) until three months ago.
- You don't need to switch to premium. All grades are temporarily allowed up to 50 ppm. There's no benefit to paying more for 95 or 98 RON to avoid sulfur during this period.
- It ends automatically. The relaxation expires after 60 days (around 11 May 2026). Standards revert to 10 ppm.
- Diesel is unaffected. Diesel has been at 10 ppm since 2009 and this change doesn't touch it.
The bigger factor in your fuel costs right now isn't sulfur levels — it's the global price spike. Comparing prices before you fill up will save you far more than worrying about parts per million.
Frequently asked questions
Is the "dirty fuel" safe to use? Yes. The temporary 50 ppm sulfur limit is the same level that premium unleaded (95 and 98 RON) had until December 2025, and three times cleaner than what regular unleaded (91 RON) was for 20 years. No car on Australian roads will be damaged by this fuel.
When does Australia go back to clean fuel? The 60-day exemption expires around 11 May 2026, at which point the 10 ppm standard resumes. The government has described this as a strictly time-limited measure.
Should I use premium fuel to avoid the dirty fuel? No. The temporary relaxation applies to all petrol grades equally — 91, 95, and 98 RON can all contain up to 50 ppm sulfur. Paying more for premium won't get you lower sulfur during this period.
Does this affect diesel? No. Diesel has had a 10 ppm sulfur limit since 2009 and is not affected by this change.
Why was Australian fuel dirtier than Europe for so long? Australia's two remaining refineries (Ampol Lytton in Brisbane and Viva Geelong in Victoria) needed expensive upgrades to produce ultra-low sulfur fuel. The government subsidised these upgrades with up to $250 million, but the work took years to complete. Political inertia and industry lobbying also delayed the standard — it was originally proposed for 2027 before being brought forward.
Will this make petrol cheaper? Not directly. The sulfur change adds supply (about 100 million litres per month), which helps prevent shortages — especially in regional areas. But pump prices are driven by international oil markets and the fuel excise, not sulfur content. The 0.6–1.0 c/L cost of producing cleaner fuel is negligible compared to the 40–60 c/L swings from the current crisis.