Ethanol and gasoline mixtures like E10 and E15 can negatively impact your engine, especially if you drive an older model car that isn't equipped to run on ethanol-mixed fuels. Some drivers have reported a breakdown of rubber seals for certain parts.

Is it OK to put 10 ethanol in my car?

All gasoline engine vehicles can use E10. Currently, only flex-fuel and light-duty vehicles with a model year of 2001 or newer are approved by the EPA to use E15. Flex-fuel vehicles can use any ethanol-gasoline blends up to E85. The energy content of ethanol is about 33% less than pure gasoline.

Is E10 bad for engines?

While a car not designed to run on E10 will likely not suffer engine damage, the ethanol can damage fuel lines and other parts of the fuel system, leading to longer term problems. E10 emissions can also damage the core of catalytic converters.