MON (Motor Octane Number)

The Motor Octane Number (MON) measures a fuel’s resistance to knocking or pinging in an engine under moderate to high speed and load conditions. It indicates how well the fuel can withstand compression without detonating prematurely, which can cause engine damage. Higher MON values mean better resistance to knocking, especially during actual driving conditions. It is determined through standardized laboratory tests and helps ensure the fuel performs reliably in engines, particularly those with higher compression ratios. In essence, MON is a key quality indicator of fuel stability and efficiency during real-world driving.