Final answer:
The proper grade fuel for a specific engine is typically listed in the owner's manual or the fuel recommendation label located near the gas cap or inside the fuel door of the vehicle. The octane rating represents the fuel's ability to resist knocking or pinging during combustion. Higher octane ratings indicate a greater resistance to knocking.
Step-by-step explanation:
The proper grade fuel for a specific engine is typically listed in the owner's manual or the fuel recommendation label located near the gas cap or inside the fuel door of the vehicle.
These sources provide information on the octane rating that the engine requires for optimal performance.
The octane rating represents the fuel's ability to resist knocking or pinging during combustion. It is determined through testing using a standard test engine and comparing the results to specific mixtures of n-heptane and isooctane. Higher octane ratings indicate a greater resistance to knocking.
For example, if a specific engine requires a fuel with an octane rating of 91, it is important to use a fuel that meets or exceeds this requirement to prevent engine damage or reduced performance.