They warn owners of any vehicle built before 2002 to avoid the new ER10 fuel while some models built before 2011 can also be affected. However, the DfT has previously warned just one percent of total vehicles will be incompatible with the new fuel when it is launched. Classic car specialists at Hagerty Insurance have warned running on E10 fuel can cause a “variety of issues in older cars”. The higher amount of ethanol can absorb water which will find its way into the car and lead to damage. READ MORE Hagerty has warned this can lead to condensation in the vehicle’s fuel tanks and cause corrosion in brass, copper, lead, tin and zinc components.