What Kind Of Gas Should You Put In A Classic Car And Why Does Choosing The Right Fuel Matter?

Classic car owners are advised to use ethanol-free gasoline (E0) to avoid compatibility issues with older engines and fuel systems. The article says most classic vehicles were not designed for modern ethanol-blended fuels, where even 10% ethanol (E10) can contribute to corrosion, rubber deterioration, water attraction, and power loss. In the U.S., the piece notes that many stations typically sell E10 rather than E0, leaving drivers to seek the lowest-ethanol premium option available, often E5 or E10. It also mentions the use of octane boosters or ethanol stabilizers for long-term storage. For engines with soft valve seats or originally intended for leaded fuel, it highlights the potential role of lead substitutes to help prevent valve seat recession, while hardened-seat engines are described as less affected.