Which Has a Higher Autoignition Point, Gasoline or Diesel

Gasoline has a higher ignition point than diesel, largely due to its high volatility. Its flash point is notably low, approximately 28 degrees Celsius.

The flash point is defined as the temperature at which oil, upon reaching a certain heat and being exposed to an open flame, ignites momentarily. The auto-ignition point refers to the temperature where oil ignites upon contacting enough air (oxygen).

Typically, a lower flash point correlates with a higher auto-ignition point. Hence, gasoline’s flash point is lower than diesel’s, but its auto-ignition point is higher.