Plain English Meaning

Chemicals made from methanol that are sometimes added to car gasoline. They are not allowed in aviation fuel because they can damage aircraft fuel systems.

Full Definition

Chemical compounds produced from methanol (a type of alcohol) that are sometimes blended into automotive gasoline as oxygenates or octane enhancers. The most common is methyl tertiary butyl ether (MTBE). These additives are not approved for use in aviation gasoline and can cause serious problems if auto fuel containing them is used in an aircraft.

Context Anchor

Seen in fuel system and fuel approval discussions, especially when checking whether automotive gasoline is approved for use in a specific aircraft.