Ethanol

Commonly asked Questions and Answers

What is Ethanol?
Ethanol is a non-fossil fuel that is produced from a variety of agricultural crops such as sugar cane and grains.

How much ethanol will be present in Unleaded E10?
Unleaded E10 will contain up to 10% ethanol blended with unleaded petrol. The Australian government has limited the amount of ethanol in petrol to 10%, or ‘E10’.

Unleaded E10 fully complies with Australian Fuels Quality Standards and supports Mobil’s proud history of supplying high-quality fuels that you can trust.

Is Unleaded E10 suitable for my car?
Most cars built after 1986 are compatible with fuel blended with up to 10% ethanol whereas many pre-1986 vehicles are not. We recommend that you follow your vehicle manufacturer’s advice. The Federal Chamber of Automotive Industries (FCAI) website contains a comprehensive list of vehicles capable of operating on ethanol blends up to a maximum of 10% ethanol. If you are unsure about your particular model, you should consult your vehicle’s handbook or manufacturer.

The FCAI website includes a list of manufacturer contacts. If you own a pre-1986 vehicle and you currently use an antivalve seat recession additive with your petrol, we recommend that you continue to do so with Unleaded E10.

Can I switch between Unleaded E10 and other grades of Mobil petrol?
Yes. If you currently use an anti-valve seat recession additive with your petrol, we recommend that you continue to do so with Unleaded E10.

Will using Unleaded E10 affect the performance of my vehicle?
Ethanol is a high-quality, high-octane fuel component. The octane in Unleaded E10 is typically above 93 RON whereas regular unleaded petrol is 91 to 92 RON.

The increased octane of Unleaded E10 may allow some engines to operate more efficiently. Unleaded E10 also contains a corrosion inhibitor to protect the fuel system and a detergent additive to keep inlet valves and fuel injectors clean.

Are there environmental benefits to using Unleaded E10?
The ethanol component means that Unleaded E10 will help to reduce your exhaust greenhouse gas emissions.

Will Unleaded E10 reduce my fuel economy?
While ethanol contains less energy than normal petrol, any changes in the fuel economy of your vehicle by using Unleaded E10 should be small. There are many variables that can affect fuel economy including the season, weather, road condition, tyre pressure, the use of air conditioners, and whether or not the vehicle is properly tuned.

Can I use Unleaded E10 in my ultralight or aircraft?
No.  Unleaded E10 is not suitable for any type of aircraft.

Can I use Unleaded E10 in my marine engine?
Ethanol has a strong affinity for water and Unleaded E10 is not recommended for use in marine engines.

Can I use Unleaded E10 in my motorcycle?
Many motorcycle manufacturers do not recommend using ethanol-blended petrol in motor cycles. Check your owner’s handbook or call your engine’s manufacturer to see if ethanol blended fuels are appropriate for use. The Federal Chamber of Automotive Industries (FCAI) website also contains a list of motorbikes capable of operating on ethanol blends up to a maximum of 10% ethanol. The FCAI website includes a list of manufacturer contacts.

Can I use Unleaded E10 in my lawnmower, chainsaw or other small engine?
You should check with the equipment’s manufacturer to see if ethanol-blended fuels are appropriate for use.

What if ethanol is not recommended for use in my car and I have inadvertently filled it with Unleaded E10?
It is unlikely that one tank of Unleaded E10 will adversely affect the performance of your vehicle. We recommend that next time you fill your car you revert to using a non-ethanol blended fuel. If you have any concerns you should contact your vehicle's servicing mechanic or your vehicle manufacturer.

Will ethanol-blended fuel attract moisture in fuel systems?
Today's automotive fuel systems are generally closed systems and allow little moisture to enter. In fact, ethanol can help absorb small amounts of moisture in a fuel system and prevent fuel line blockage with ice in the winter.

What if my car’s tank has some water in it right now?
Over time, some water accumulation is normal in vehicle fuel tanks. This occurs through condensation of moisture as temperatures cycle downward during the night.

In the unlikely event that the water level is too high, it can combine with the ethanol, separate and fall to the bottom of the vehicle's fuel tank. If this happens, the vehicle will not operate properly and the fuel will have to be removed (and disposed of properly) and replaced with new fuel. However, this situation is highly unlikely.