Why owners of older cars should be wary of new E10 eco-fuel

Experts have warned that the new fuel, to be introduced next year, could damage classic vehicles.

- Advertisement -

Classic car owners are being warned about a new eco-friendly petrol that could damage their cars.

Under current regulations, ‘E5’ unleaded petrol can contain up to 5% bioethanol, which is created from crops and is therefore a renewable resource.

From 2021, E10 will become the new standard, which has up to 10% bioethanol in the mix.

Doing this helps to reduce vehicle CO2 emissions – by up to 750,000 tonnes per year, according to government estimates – but classic car insurance company Hagerty is warning that E10 can cause damage to older vehicles.

The RAC estimates up to 600,000 vehicles on UK roads are not compatible with E10. Although classic cars are the most at-risk vehicle type, it is also advised that owners of any vehicles made before 2002 do not use the new E10 fuel.

There are two key issues, with the first being that this fuel mix absorbs more water from the atmosphere, which can cause condensation in fuel tanks, fuel lines and carburettors, and cause corrosion.

The second problem is that ethanol is a solvent that can eat through rubber, plastic and fibreglass, with Department for Transport tests identifying that it can cause issues with fuel hoses and seals, blocked fuel filters and damaged fuel pumps to name a few.

Phil Monger, technical director of the Petrol Retailers Association (PRA) told Hagerty that changes won’t be made overnight, and believes that ‘many owners of old cars may have already made modifications since the introduction of E5 fuel’.

He added: “Vehicles that are very old will have materials that will not be compatible with E5 either. E10 will only hasten the day when it causes you some difficulty with those materials.”

Guy Lachlan, managing director of Classic Oils, has offered advice to prevent problems, saying: “You’ve either got to use fuel with no ethanol or change the materials that don’t like it.

“If you are in any doubt about your rubber fuel lines, change them. Get rid of your fibreglass petrol tank and install an aluminium one. The other thing ethanol really doesn’t like is solder. If you are running a soldered float in your carburettor, then think about carrying a spare – they’re generally quite easy to change.”

If classic car owners fill up with E10 by mistake, it shouldn’t be an issue if it’s a one-off, so just ensure the next top-up is with the correct fuel.

The PRA says there will be a six-month awareness campaign released ahead of the fuel being introduced to prepare drivers, while a new website will allow owners to check if their vehicle is compatible.

- Advertisement -
Darren Cassey
Darren Cassey
Articles by Darren Cassey are provided for The Car Expert by PA Media (formerly the Press Association). They include test drives of the latest new cars and features on various aspects of automotive life.

Latest Expert Advice

Vehicle thefts increase by 56% in four years

Thefts of motor vehicles across Britain have risen by 56% in four years, according to police data obtained by RAC Insurance.

Drivers facing petrol price rises as lockdown eases

The average price of fuel went up in June, ending three months of price drops as lockdown eased – but it's still cheaper than in January.

Latest Expert Ratings

Polestar 1

The Polestar 1 is the first car from Volvo's new electric car brand. It has received positive media reviews, albeit with some reservations.

Vauxhall Corsa-e

Initial reviews of the Vauxhall Corsa-e have been positive, and the electric model's Expert Rating is notably better than the regular Corsa.

Hot new Cupra el-Born EV unveiled

Cupra has unveiled its first production-ready EV with the new el-Born – a model that was originally meant to wear a SEAT badge.

Peugeot 108 updated with new colours and options

Peugeot has given its 108 city car a refresh for 2020, adding new colour choices for the exterior as well as upgrades inside the cabin.

Vehicle thefts increase by 56% in four years

Thefts of motor vehicles across Britain have risen by 56% in four years, according to police data obtained by RAC Insurance.

Renault Grand Scenic and Koleos get the chop

Renault has dropped the guillotine on two of the largest models in its range – the Grand Scenic people carrier and the Koleos SUV.

More from The Car Expert

Expert Advice

Award-winning, independent and impartial advice on buying, financing, owning and running a car

Expert Ratings

We analyse and aggregate dozens of media reviews for each new car into an overall Expert Rating

Expert News

All the most important new car launches, model updates, car reviews and industry news

Expert Partners

Our new space for commercial partners to bring you special offers on their products and services

1 COMMENT

  1. E10 is crap fuel. BTW So is electric vehicles – how much extra fossil fuels will be needed to charge these vehicles….hydrogen and combustion engines are the way forward…..

What are your thoughts? Let us know below.