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Originally Posted by SnoopZ
My Tesco has replaced E5 at its pumps with E10 and renamed Unleaded Super to E5 Premium which is 11 pence more, i can easily see alot of people using E10 by mistake and causing damage to their cars.
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Can I mix E5 and E10?
That shouldn't be a problem.
In fact, the RAC recommends drivers with an older car who fill up with E10 by mistake top up with E5 as soon as possible after they have used a third of the tank.
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What to do if you put E10 petrol in a non-compatible vehicle
Simply fill up with E5 (‘97+ octane) petrol next time.
Using a single tank of E10 petrol in a vehicle that is not compatible should not be a major problem. Just make sure you fill up with the correct E5 (‘97+ octane) petrol grade next time.
Unlike putting petrol into a diesel engine, you shouldn’t need to drain the tank. On a one-time basis, your vehicle will not suffer engine damage as a result. Prolonged use of E10 petrol in a non-compatible vehicle, however, may cause harm and is not recommended.
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Are there any other drawbacks?
If E10 fuel is put in an incompatible car, it will still run, according to the RAC,
But in the long run, it could cause damage to rubber seals, plastics and metals.
There have also been reports E10 is a less stable fuel, the RAC says.
And this could make it more difficult to start a car that has not been driven for quite a while.
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It's another example of a misleading set of environmental claims. Same as calling electric vehicles, "zero-emission". The emissions occur elsewhere.
It's meant to reduce CO2 output by the engines, but misses out the bit that producing the ethanol, also produces CO2.
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The production of renewable ethanol for blending with fossil petrol also results in valuable by-products, including animal feed and stored CO2.
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Which is then likely to be used by various industries(food production, brewing) and released into the atmosphere anyway.